鸿蒙NEXT（五）：鸿蒙版React Native架构浅析
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.markdown-body h3:before { border-bottom: 2px solid rgba(77, 208, 225, 1); width: 100%; content: ""; display: block; height: 28px; position: absolute; left: 0; top: 0; bottom: -2px; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); background-repeat: no-repeat; animation: 2s infinite alternate h3animationbefore }
@keyframes h3AnimationBefore { 0% { width: 28px } 25% { width: 100% } 50% { width: 100% } 100% { width: 100% } }
.markdown-body h3:after { content: ""; display: block; width: 28px; height: 28px; position: absolute; border: 2px solid rgba(77, 208, 225, 1); border-radius: 50%; right: -15px; top: 0; bottom: 0; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); animation: 2s infinite alternate h3animationafter }
@keyframes h3AnimationAfter { 0% { } 10% { } 50% { transform: rotate(-1turn) } 100% { transform: rotate(-1turn) } }
.markdown-body h4 { font-size: 16px }
.markdown-body h5 { font-size: 15px }
.markdown-body h6 { margin-top: 5px }
.markdown-body p { line-height: inherit; margin: 22px 0; letter-spacing: 2px; font-size: 14px; word-spacing: 2px }
.markdown-body img { max-width: 80%; border-radius: 6px; display: block; margin: 20px auto !important; object-fit: contain; box-shadow: 0 0 16px rgba(110, 110, 110, 0.45) }
.markdown-body figcaption { display: block; font-size: 13px; color: rgba(43, 43, 43, 1) }
.markdown-body figcaption:before { content: ""; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAGFBMVEVHcExAuPtAuPpAuPtAuPpAuPtAvPxAuPokzOX5AAAAB3RSTlMAkDLqNegkoiUM7wAAAGBJREFUKM9jYBhcgMkBTUDVBE1BeDGqEtXychNUBeXlKEqACsrLQxB8lnCQQClCiWt5OYoSiAIkJVAF5eVBqAqAShTAAs7l5ShKWMwRAmAlSArASpAVgJUkCqIAscESHwCVVjMBK9JnbQAAAABJRU5ErkJggg=="); display: inline-block; width: 18px; height: 18px; background-size: 18px; background-repeat: no-repeat; background-position: center; margin-right: 5px; margin-bottom: -5px }
.markdown-body hr { border-top: 1px solid rgba(77, 208, 225, 1); border-right: none; border-bottom: none; border-left: none; margin-top: 32px; margin-bottom: 32px }
.markdown-body del { color: rgba(77, 208, 225, 1) }
.markdown-body code { border-radius: 2px; overflow-x: auto; background-color: rgba(77, 208, 225, 0.08); color: rgba(38, 198, 218, 1); padding: 0.195em 0.4em }
.markdown-body pre { font-family: Menlo, Monaco, Consolas, Courier New, monospace; overflow: auto; position: relative; line-height: 1.75; box-shadow: 0 0 8px rgba(110, 110, 110, 0.45); border-radius: 4px; margin: 16px }
.markdown-body pre:before { content: ""; display: block; height: 30px; width: 100%; margin-bottom: -7px; background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAAAdCAYAAABcz8ldAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAhgSURBVGhD7Zp7bBTHHcdn33t7vvOdzy+ITVKDU0xIKG2ABCPTRCCaUiEVKWoqRJuASAhCitRCVKSoalFUKZBiSmmFRRJKRUnUtIpo+aNqGgwoOCmuFUIRzxjwE4zte+97drYzztji8HPvtkit/PnH+n1397Tz+83vN/PbMZhmmmmm+d+BoX8n5diihcGqgFQf5vk6BMAskWUlw3GyFnIvtqWSf91w7mKC3npfOLX7wYeiIa6BBWCOLLFRF2NB0JvIOP/80YG+k2ev6S699b/OzOfKBW5l5KsgyC4DCFQDnpEAdE1goc/dlNPc/Up7P711UiYNSMuyxeUzZPnHgGHWh5XADEkSAcdiN+AnEXIBhBComgFU0/xQR+jnj51sOUMf9Z0NKyL8S9+JPBEN8zuCMrsqGOA5QWAAyzLAxe53HBeYFgJp1c5Cx33nyIfpV3e+22/Sx32nev/sMCgVnmM4bjOniAtZWQAsz315EfsGQQc4hgWcjHkCmOj1rheuNn95cXwmDMiVp5etC/D8m5FwUWVQUYYGPh6mZYFUOgsGVa1pXvOZzVT2jRuH54RM230jEuI3RcIiL4l4UkxAJmuD/riVsqD7ct2m9nep7BtVTbVfZ0uE/UIk+CQflAHDjf8+Lg6MldYATGpH3c/Ul7p3dWXppVGM6eElJSHmnQWPbSlRlN1lJcUBjqNRnwJZVQO3B5P/uq5rK1d90pakckFcaKp5UJHY92JR8YlwkUDVySEZfGfQdO7E7Z8s2HL9TSoXTPXRud9nA8IBqSwcZgWeqpPj6BYw7yTbXBN9q2v9lQEq5zBmWA8vWLCptCi4tzwW8RQMQlFQATPLSh6vCSh/plJBkMyQBHZfWYnkKRgEktEVpTJXERN2Xzo4ex2VC6K6qXYpF5b3ypVRT8EgcAERSJXRbwCBOTFzXblM5RxGBaRt+ZPYA+LO0mgxz5K1Ig+UgAzKIuGnz39z6S+olDeaibaXRsU1RUFvgx+GwTWgPCaDgMw2XXpr9gwq50XV0bkxJiYeEiNF5cwE5XsiOEkAUkXkUW51SSOVchjl8WKef604XFSRbzCGCYeCoESStv/p8QU1VPIM3knNDynctnBRfsEYhgSlNCIGgQv2UCkvGIHZgteMh1nBW9W4F16RAM6yDVV7amZTaYQcr59cuuhhWRTWBvAMLxQGeyFSHOLnh0MvUskz5RF+fbRYDEy0mZgqQYUHOLhr//b6rGoqeaLqQG0pw3PrBbyA+4EQUkRmhvgqNUfICUipKK4OKUqIJVPKB0jpEhjmWWp64jdbKmVZZNYogcJm493gsifOqhDyeh9GYR/FM7sW+DA5CKR0MSK3tvKZkpwB5gRE4tjFEr7RL0iWBGV51vHFCyupNGWWPqLgnoer9mtyEGSJAzwLllDTGzyznDjRN/CwOFkoFb4bm0eVIXICgpvdGoEvrF7fC89zfLkkeV5HbOhWiTwTpKYvCAJLGshRdXtKMKAWlyxq+MPQLk1h66g5RE5ABJYNFrqY3wvJklJRUKg5ZWLFXIA86yek2uDOPkBNb3CM5Pf7DL2QyIrUGiLH+xC5Bmmm/ARnHUhC6PnzxWDK0RH5HuIjZGy27erU9AZ0dTIWXyG+NpBBrSFySxZw220IqeUPFoS6jVAPNadM7yDsgNB1qOkLuAziMYIb1PQGA75wIaKGPyAb+9oF16g5RE5ALIQ+tSyLWoWDEAK6aXW3JlK9VJoyx1oyvVkNdvo5KXXDAVkdnaKmNwx0xjH98w3JNmTCm+Bc9hKVhsgJSI9pvp9Vdd++jmq6AXB2/HHrhcs5aTkVDv0DFzoHvKdq/mQsKX/4t7KJLDpOJW+IbAvMGoMkxfwAWZB8DT7W1diTE+WcgKz6pK1bs6z3daPwmJDsSKt6ZsCyjlLJMz0DsDGZ8SdlDROBjOb8YeWOjptU8kTXusuaazu7oJrfEnQvdkpVcUn6PTVHyAkIIW7br/Unklni0EJIZ1WgGsauZR+fvUglz6zY0dGfVp09ybRNlfwgi3k8YSbvJJ29VMoLt9v6rZVQL7hOYUubndHJGclBtzn1byqNMCogi09/2nFb01/oj+f/5TyjauBOKtPcZ1r7qZQ3f2lRfxZPWi2anp8TSDAGExZMa2jr8u03L1M5L7q3Xc+iAeuHRl/ScvPcjSLDBnZS/cjtNHd2v3171Ewbs9N5q7Pn4otVMx3btBsCsoRbk1FxG5dMVgMDqfTpXl1/tuFMa5zKefPROdX59qLQBwLnNog8Wy1OcjB1N+QEsW/QsFNZuO35Xb1v98QLX4/Sx+O3wqujrQ6013ABUWI8+AaqBjAH01+ghL22+5X2PirnMG7r+esbnae/V1neauvGSoHjigTcVU7UGFm2DeK4ttxKpQ+mLPvl+o/PjnkAkw9HTqSMmVHhyAMx9iFcSh/BHTfLceO/C8mKjApBf9zszGhoY92m9sN+BGOY9AeD7eGniv8OTaOB4dgyTsQd9wS+IQu4lciYdkI7CLrNH3Rvbb9FL41i0tbzVP2iWJkobpN5fmM4IJfJskTP1Bk8A9HQmbpmGDBrWqdVCN/Yd7PjxKGOXn+bmbto3feVVcVB9qehIL8EJy8nChwgr0O2xxBnhGU5eP2CfYbl/m4gBRsbtneMORP9oGpjpcCsiKzHHfdOPiQ/wMniyFEu2dbiTQCAeN/vavC466BGYLttXc9fmXBXMGlAhiHHur+sq6uPiUI9z7CVHMPwBnLSuuN8FuC48/Oaz1ylt94XfrW5ouyprwWfYRkwNyCyYYjwkBHows1fa+tV/fzGxlv39b9gqvfPmQ+i/HK8KlcBjhHwfl8HEHyOd1JnuzZd66S3TTPNNNP8/wDAfwDG7G0m9LKBpwAAAABJRU5ErkJggg==") 10px 10px / 40px no-repeat }
.markdown-body pre>code { font-size: 12px; padding: 15px 12px; margin: 0; word-break: normal; display: block; overflow-x: auto; color: rgba(51, 51, 51, 1); background: rgba(248, 248, 248, 1) }
.markdown-body a { color: rgba(77, 208, 225, 1); border-bottom: 1px solid rgba(77, 208, 225, 1); font-weight: 400; text-decoration: none; margin: 0 4px }
.markdown-body a:active, .markdown-body a:hover { background-color: rgba(77, 208, 225, 0.1) }
.markdown-body strong { color: rgba(38, 198, 218, 1) }
.markdown-body strong:before { content: "「" }
.markdown-body strong:after { content: "」" }
.markdown-body em { font-style: normal; color: rgba(77, 208, 225, 1); font-weight: 700 }
.markdown-body table { display: inline-block !important; font-size: 12px; width: auto; max-width: 100%; overflow: auto; border: 1px solid rgba(246, 246, 246, 1) }
.markdown-body thead { background: rgba(246, 246, 246, 1); color: rgba(0, 0, 0, 1); text-align: left }
.markdown-body tr:nth-child(2n) { background-color: rgba(77, 208, 225, 0.05) }
.markdown-body td, .markdown-body th { padding: 12px 7px; line-height: 24px }
.markdown-body td { min-width: 120px }
.markdown-body blockquote { margin: 2em 0; padding: 24px 32px; border-left: 4px solid rgba(38, 198, 218, 1); background: rgba(77, 208, 225, 0.15); position: relative }
.markdown-body blockquote:before { content: "❝"; top: 8px; left: 8px; color: rgba(77, 208, 225, 1); font-size: 30px; line-height: 1; font-weight: 700; position: absolute; opacity: 0.7 }
.markdown-body blockquote:after { content: "❞"; font-size: 30px; position: absolute; right: 8px; bottom: 0; color: rgba(77, 208, 225, 1); opacity: 0.7 }
.markdown-body blockquote p { color: rgba(89, 89, 89, 1); line-height: 2 }
.markdown-body ol, .markdown-body ul { color: rgba(89, 89, 89, 1); padding-left: 28px }
.markdown-body ol li, .markdown-body ul li { margin-bottom: 0; list-style: inherit }
.markdown-body ol li .task-list-item, .markdown-body ul li .task-list-item { list-style: none }
.markdown-body ol li .task-list-item ol, .markdown-body ol li .task-list-item ul, .markdown-body ul li .task-list-item ol, .markdown-body ul li .task-list-item ul { margin-top: 0 }
.markdown-body ol ol, .markdown-body ol ul, .markdown-body ul ol, .markdown-body ul ul { margin-top: 3px }
.markdown-body ol li { padding-left: 6px }
@media (max-width: 720px) { .markdown-body h1 { font-size: 24px } .markdown-body h2 { font-size: 20px } .markdown-body h3 { font-size: 18px } }.markdown-body pre, .markdown-body pre>code.hljs { background: rgba(30, 30, 30, 1); color: rgba(220, 220, 220, 1) }
.hljs-keyword, .hljs-link, .hljs-literal, .hljs-name, .hljs-symbol { color: rgba(86, 156, 214, 1) }
.hljs-link { text-decoration: underline }
.hljs-built_in, .hljs-type { color: rgba(78, 201, 176, 1) }
.hljs-class, .hljs-number { color: rgba(184, 215, 163, 1) }
.hljs-meta-string, .hljs-string { color: rgba(214, 157, 133, 1) }
.hljs-regexp, .hljs-template-tag { color: rgba(154, 83, 52, 1) }
.hljs-formula, .hljs-function, .hljs-params, .hljs-subst, .hljs-title { color: rgba(220, 220, 220, 1) }
.hljs-comment, .hljs-quote { color: rgba(87, 166, 74, 1); font-style: italic }
.hljs-doctag { color: rgba(96, 139, 78, 1) }
.hljs-meta, .hljs-meta-keyword, .hljs-tag { color: rgba(155, 155, 155, 1) }
.hljs-template-variable, .hljs-variable { color: rgba(189, 99, 197, 1) }
.hljs-attr, .hljs-attribute, .hljs-builtin-name { color: rgba(156, 220, 254, 1) }
.hljs-section { color: rgba(255, 215, 0, 1) }
.hljs-emphasis { font-style: italic }
.hljs-strong { font-weight: 700 }
.hljs-bullet, .hljs-selector-attr, .hljs-selector-class, .hljs-selector-id, .hljs-selector-pseudo, .hljs-selector-tag { color: rgba(215, 186, 125, 1) }
.hljs-addition { background-color: rgba(20, 66, 18, 1) }
.hljs-addition, .hljs-deletion { display: inline-block; width: 100% }
.hljs-deletion { background-color: rgba(102, 0, 0, 1) }
.markdown-body { line-height: 1.75; font-weight: 400; font-size: 15px; overflow-x: hidden; color: rgba(43, 43, 43, 1); font-family: -apple-system, system-ui, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif; background-image: linear-gradient(90deg, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0), linear-gradient(1turn, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0); background-size: 20px 20px; background-position: center }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { padding: 30px 0; margin-top: 35px; margin-bottom: 10px; color: rgba(77, 208, 225, 1) }
.markdown-body h1 { font-size: 30px; text-align: center; position: relative; width: max-content; margin: 0 auto }
.markdown-body h1:before { position: absolute; content: ""; z-index: -1; top: -20px; height: 100%; width: 100px; left: 0; right: 0; margin: 0 auto; background: 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@keyframes h1Animate { 0% { background-position: right bottom } 50% { background-position: right } 100% { background-position: right bottom } }
.markdown-body h2 { display: block; border-bottom: 4px solid rgba(77, 208, 225, 1); position: relative; font-size: 24px; padding: 12px 32px; margin: 30px 0 }
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.markdown-body h2:after, .markdown-body h2:before { content: ""; display: block; position: absolute; bottom: 0 }
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.markdown-body h3 { margin: 30px 0; font-size: 18px; position: relative; padding: 4px 32px; width: max-content }
.markdown-body h3:before { border-bottom: 2px solid rgba(77, 208, 225, 1); width: 100%; content: ""; display: block; height: 28px; position: absolute; left: 0; top: 0; bottom: -2px; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); background-repeat: no-repeat; animation: 2s infinite alternate h3animationbefore }
@keyframes h3AnimationBefore { 0% { width: 28px } 25% { width: 100% } 50% { width: 100% } 100% { width: 100% } }
.markdown-body h3:after { content: ""; display: block; width: 28px; height: 28px; position: absolute; border: 2px solid rgba(77, 208, 225, 1); border-radius: 50%; right: -15px; top: 0; bottom: 0; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); animation: 2s infinite alternate h3animationafter }
@keyframes h3AnimationAfter { 0% { } 10% { } 50% { transform: rotate(-1turn) } 100% { transform: rotate(-1turn) } }
.markdown-body h4 { font-size: 16px }
.markdown-body h5 { font-size: 15px }
.markdown-body h6 { margin-top: 5px }
.markdown-body p { line-height: inherit; margin: 22px 0; letter-spacing: 2px; font-size: 14px; word-spacing: 2px }
.markdown-body img { max-width: 80%; border-radius: 6px; display: block; margin: 20px auto !important; object-fit: contain; box-shadow: 0 0 16px rgba(110, 110, 110, 0.45) }
.markdown-body figcaption { display: block; font-size: 13px; color: rgba(43, 43, 43, 1) }
.markdown-body figcaption:before { content: ""; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAGFBMVEVHcExAuPtAuPpAuPtAuPpAuPtAvPxAuPokzOX5AAAAB3RSTlMAkDLqNegkoiUM7wAAAGBJREFUKM9jYBhcgMkBTUDVBE1BeDGqEtXychNUBeXlKEqACsrLQxB8lnCQQClCiWt5OYoSiAIkJVAF5eVBqAqAShTAAs7l5ShKWMwRAmAlSArASpAVgJUkCqIAscESHwCVVjMBK9JnbQAAAABJRU5ErkJggg=="); display: inline-block; width: 18px; height: 18px; background-size: 18px; background-repeat: no-repeat; background-position: center; margin-right: 5px; margin-bottom: -5px }
.markdown-body hr { border-top: 1px solid rgba(77, 208, 225, 1); border-right: none; border-bottom: none; border-left: none; margin-top: 32px; margin-bottom: 32px }
.markdown-body del { color: rgba(77, 208, 225, 1) }
.markdown-body code { border-radius: 2px; overflow-x: auto; background-color: rgba(77, 208, 225, 0.08); color: rgba(38, 198, 218, 1); padding: 0.195em 0.4em }
.markdown-body pre { font-family: Menlo, Monaco, Consolas, Courier New, monospace; overflow: auto; position: relative; line-height: 1.75; box-shadow: 0 0 8px rgba(110, 110, 110, 0.45); border-radius: 4px; margin: 16px }
.markdown-body pre:before { content: ""; display: block; height: 30px; width: 100%; margin-bottom: -7px; background: url("data:image/png;base64,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") 10px 10px / 40px no-repeat }
.markdown-body pre>code { font-size: 12px; padding: 15px 12px; margin: 0; word-break: normal; display: block; overflow-x: auto; color: rgba(51, 51, 51, 1); background: rgba(248, 248, 248, 1) }
.markdown-body a { color: rgba(77, 208, 225, 1); border-bottom: 1px solid rgba(77, 208, 225, 1); font-weight: 400; text-decoration: none; margin: 0 4px }
.markdown-body a:active, .markdown-body a:hover { background-color: rgba(77, 208, 225, 0.1) }
.markdown-body strong { color: rgba(38, 198, 218, 1) }
.markdown-body strong:before { content: "「" }
.markdown-body strong:after { content: "」" }
.markdown-body em { font-style: normal; color: rgba(77, 208, 225, 1); font-weight: 700 }
.markdown-body table { display: inline-block !important; font-size: 12px; width: auto; max-width: 100%; overflow: auto; border: 1px solid rgba(246, 246, 246, 1) }
.markdown-body thead { background: rgba(246, 246, 246, 1); color: rgba(0, 0, 0, 1); text-align: left }
.markdown-body tr:nth-child(2n) { background-color: rgba(77, 208, 225, 0.05) }
.markdown-body td, .markdown-body th { padding: 12px 7px; line-height: 24px }
.markdown-body td { min-width: 120px }
.markdown-body blockquote { margin: 2em 0; padding: 24px 32px; border-left: 4px solid rgba(38, 198, 218, 1); background: rgba(77, 208, 225, 0.15); position: relative }
.markdown-body blockquote:before { content: "❝"; top: 8px; left: 8px; color: rgba(77, 208, 225, 1); font-size: 30px; line-height: 1; font-weight: 700; position: absolute; opacity: 0.7 }
.markdown-body blockquote:after { content: "❞"; font-size: 30px; position: absolute; right: 8px; bottom: 0; color: rgba(77, 208, 225, 1); opacity: 0.7 }
.markdown-body blockquote p { color: rgba(89, 89, 89, 1); line-height: 2 }
.markdown-body ol, .markdown-body ul { color: rgba(89, 89, 89, 1); padding-left: 28px }
.markdown-body ol li, .markdown-body ul li { margin-bottom: 0; list-style: inherit }
.markdown-body ol li .task-list-item, .markdown-body ul li .task-list-item { list-style: none }
.markdown-body ol li .task-list-item ol, .markdown-body ol li .task-list-item ul, .markdown-body ul li .task-list-item ol, .markdown-body ul li .task-list-item ul { margin-top: 0 }
.markdown-body ol ol, .markdown-body ol ul, .markdown-body ul ol, .markdown-body ul ul { margin-top: 3px }
.markdown-body ol li { padding-left: 6px }
@media (max-width: 720px) { .markdown-body h1 { font-size: 24px } .markdown-body h2 { font-size: 20px } .markdown-body h3 { font-size: 18px } }.markdown-body pre, .markdown-body pre>code.hljs { background: rgba(30, 30, 30, 1); color: rgba(220, 220, 220, 1) }
.hljs-keyword, .hljs-link, .hljs-literal, .hljs-name, .hljs-symbol { color: rgba(86, 156, 214, 1) }
.hljs-link { text-decoration: underline }
.hljs-built_in, .hljs-type { color: rgba(78, 201, 176, 1) }
.hljs-class, .hljs-number { color: rgba(184, 215, 163, 1) }
.hljs-meta-string, .hljs-string { color: rgba(214, 157, 133, 1) }
.hljs-regexp, .hljs-template-tag { color: rgba(154, 83, 52, 1) }
.hljs-formula, .hljs-function, .hljs-params, .hljs-subst, .hljs-title { color: rgba(220, 220, 220, 1) }
.hljs-comment, .hljs-quote { color: rgba(87, 166, 74, 1); font-style: italic }
.hljs-doctag { color: rgba(96, 139, 78, 1) }
.hljs-meta, .hljs-meta-keyword, .hljs-tag { color: rgba(155, 155, 155, 1) }
.hljs-template-variable, .hljs-variable { color: rgba(189, 99, 197, 1) }
.hljs-attr, .hljs-attribute, .hljs-builtin-name { color: rgba(156, 220, 254, 1) }
.hljs-section { color: rgba(255, 215, 0, 1) }
.hljs-emphasis { font-style: italic }
.hljs-strong { font-weight: 700 }
.hljs-bullet, .hljs-selector-attr, .hljs-selector-class, .hljs-selector-id, .hljs-selector-pseudo, .hljs-selector-tag { color: rgba(215, 186, 125, 1) }
.hljs-addition { background-color: rgba(20, 66, 18, 1) }
.hljs-addition, .hljs-deletion { display: inline-block; width: 100% }
.hljs-deletion { background-color: rgba(102, 0, 0, 1) }
鸿蒙版React Native架构
如图，React Native for OpenHarmony 在 React Native 的新架构（0.68以及之后的版本）的基础上，进行了鸿蒙化的适配。按照功能可以进行如下的划分：
- RN 应用代码：开发者实现的业务代码。
- RN 库代码：在 React Native 供开发者使用的组件和API的封装与声明。
- JSI（JavaScript Interface）：JavaScript 与 CPP 之间进行通信的API。
- React Common：所有平台通用的 CPP 代码，用于对 RN 侧传过来的数据进行预处理。
- OpenHarmony 适配代码：接收并处理 React Common 传过来的数据，对接原生的代码，调用 ArkUI 的原生组件与 API。主要包括了两个部分：分别是 TurboModule 与 Fabric。
- OS代码：对接系统底层功能，根据适配层代码传过来的数据进行渲染，或完成对应的功能。
React Native库代码
在现行的 React Native 中，有很多属性是在React侧完成的封装，也有很多属性是平台独有的。为了达成这个效果，React Native 在JS侧根据Platform增加了很多判断。所以，React Native 的鸿蒙化适配也需要增加HarmonyOS相关的平台判断，与相应的组件属性的封装。为此，鸿蒙化团队提供了react-native-harmony的tgz包，并通过更改metro.config.js配置，将该tgz包应用到 Metro Bundler中。
React Native 还提供了很多库的封装，例如Codegen、打包工具等。为此，鸿蒙化团队提供了react-native-harmony-cli的包，对这些库进行了HarmonyOS平台的适配，用于向开发者提供相关的功能。
Fabric
Fabric 是 React Native 的组件渲染系统。接收 React Native 传过来的组件信息，处理后发送给原生OS，由OS完成页面的渲染。
在适配方案中，组件不通过复杂的流程对接到ArkUI的声明式范式上，而是直接使用XComponent对接到ArkUI的后端接口进行渲染，缩短了流程，提高了组件渲染的效率。C-API的性能收益包括以下的几个部分：
- C端最小化、无跨语言的组件创建和属性设置；
- 无跨语言前的数据格式转换，不需要将string，enum等数据类型转换为object，可以在CPP侧直接使用对应的数据进行处理；
- 可以进行属性Diff，避免重复设置，降低了属性设置的开销。
渲染流水线请参考渲染三阶段。
TurboModule
TurboModule 是 React Native 中用于 JavaScript 和原生代码进行交互的模块，为RN JS应用提供调用系统能力的机制。根据是否依赖 HarmonyOS系统相关的能力，可以分为两类：cxxTurboModule和ArkTSTurboModule。
- ArkTSTurboModule：
- ArkTSTurboModule为 React Native 提供了调用ArkTS原生API的方法。可以分为同步与异步两种。
- ArkTSTurboModule依赖NAPI进行原生代码与CPP侧的通信。包括JS与C之间的类型转换，同步和异步调用的实现等。
- cxxTurboModule：
- cxxTurboModule主要提供的是不需要系统参与的能力，例如NativeAnimatedTurboModule主要提供了数据计算的相关能力。
- cxxTurboModule不依赖于系统的原生API，为了提高相互通信的效率，一般是在cpp侧实现，这样可以减少native与cpp之间的通信次数，提高性能。
React Native线程模型
RNOH线程模型
RNOH的线程一共有3个：
enum TaskThread {
MAIN = 0, // main thread running the eTS event loop
JS, // React Native's JS runtime thread
BACKGROUND, // background tasks queue
};
MAIN/UI线程
RN业务主线程，也是应用主线，应用UI线程。该线程在应用中有唯一实例。
RN在MAIN线程中主要承担的业务功能是：
- ArkUI组件的生命周期管理：CREATE, UPDATE, INSERT, REMOVE, DELETE；
- ArkUI组件树管理；
- RN TurboModule业务功能运行；
- 交互事件、消息处理。
JS线程
JS线程通过虚拟机执行React（JS）代码，通过React代码与RN Common的核心代码交互完成React Native的Render阶段任务。
RN在JS线程中主要承担的业务功能是：
- 加载Bundle，执行Bundle依赖的React代码和Bundle的业务代码。
- 由React业务代码驱动，创建RN ShadowTree，设置ShadowTree的属性。
- 利用Yoga引擎进行组件布局，文本测量和布局。
- 比较完成布局的新、老ShadowTree，生成差异结果mutations。将mutations提交到MAIN线程触发Native的显示刷新。
- 交互事件、消息处理。
JS线程与RNInstance的实例绑定，有多个RNInstance，则有多个对应的JS线程。
BACKGROUND线程
BACKGROUND线程是RN的实验特性，开启BACKGROUND线程后，会将JS线程的部分布局、ShadowTree比较的任务迁移到该线程执行，从而降低JS线程的负荷。
由于开启BACKGROUND涉及复杂的线程间通信，在稳定性方面带来风险，因此正式商用版本中不要开启BACKGROUND线程。
RNOH线程的长期演进
MAIN线程和JS线程承担了RN框架的全部业务，在重载情况下可能会造成性能瓶颈。RN的业务也受同线程的其他应用代码的影响，造成执行延迟或阻塞等问题。
在长期演进时，可以考虑进行线程扩展：
- 增加唯一TM线程，将TurboModule的业务代码放到TM线程来执行，从而降低MAIN线程负荷。
- 增加单独的TIMER线程，确保时间基准稳定执行。
典型线程Trace图
- 线程号53130：MAIN线程
- 线程号53214：JS线程实例1
- 线程号53216：JS线程实例2
命令式组件
XComponent接入
CAPI 版本使用XComponent总共分成了两个步骤：
- createSurface的时候创建XComponentSurface；
- startSurface的时候将CPP的XComponentSurface连接到ArkUI的Xcomponent上。
createSurface的时候主要做了以下的操作：
- 创建并将XComponentSurface记录到Map中：
void RNInstanceCAPI::createSurface(
facebook::react::Tag surfaceId,
std::string const& moduleName) {
m_surfaceById.emplace(
surfaceId,
XComponentSurface(
···
surfaceId,
moduleName));
}
- 在XComponentSurface中创建rootView，用于挂载C-API的组件，并在Surface上统一处理Touch事件：
XComponentSurface::XComponentSurface(
···
SurfaceId surfaceId,
std::string const& appKey)
:
···
m_nativeXComponent(nullptr),
m_rootView(nullptr),
m_surfaceHandler(SurfaceHandler(appKey, surfaceId)) {
m_scheduler->registerSurface(m_surfaceHandler);
m_rootView = componentInstanceFactory->create(
surfaceId, facebook::react::RootShadowNode::Handle(), "RootView");
m_componentInstanceRegistry->insert(m_rootView);
m_touchEventHandler = std::make_unique<SurfaceTouchEventHandler>(m_rootView);
}
startSurface的时候主要做了以下的操作：
- 在ArkTS侧创建XComponent，并设置id，type与libraryname属性。其中：
- id：组件的唯一标识，又由InstanceID和SurfaceID共同组成，记录了此XComponent属于哪一个Instance与Surface；
- type：node，标识该XComponent是一个占位组件，组件的实现都在CAPI侧；
- libraryname：表示C-API组件在哪个so库中实现，并加载该so库，自动调用该so中定义的Init函数。当前React Native for OpenHarmony默认的so名字为rnoh_app。
XComponent({
id: this.ctx.rnInstance.getId() + "_" + this.surfaceHandle.getTag(),
type: "node",
libraryname: 'rnoh_app'
})
- 在CPP侧的Init中调用registerNativeXComponent函数，该函数中调用了OH_NativeXComponent_GetXComponentId用于获取ArkTS设置的id，并根据id找到对应的Instance与Surface。同时还要获取nativeXComponent对象，记录ArkTS侧的XComponent。
if (OH_NativeXComponent_GetXComponentId(nativeXComponent, idStr, &idSize) !=
OH_NATIVEXCOMPONENT_RESULT_SUCCESS) {
···
}
std::string xcomponentStr(idStr);
std::stringstream ss(xcomponentStr);
std::string instanceId;
std::getline(ss, instanceId, '_');
std::string surfaceId;
std::getline(ss, surfaceId, '_');
- 调用OH_NativeXComponent_AttachNativeRootNode，将XComponentSurface中记录的rootView连接到ArkTS侧的XComponent上：
OH_NativeXComponent_AttachNativeRootNode(
nativeXComponent,
rootView.getLocalRootArkUINode().getArkUINodeHandle());
- 将rootView连接到XComponent后，rootView就作为CAPI组件的根节点，后续的子孙节点通过Mutation指令逐个插入到组件树上。
CAPI组件向上对接RN指令
- 在RN鸿蒙适配层中，SchedulerDelegate.cpp负责处理RN Common传递下来的指令。
void SchedulerDelegate::schedulerDidFinishTransaction(MountingCoordinator::Shared mountingCoordinator) {
...
}
- 在 MountingManagerCAPI.cpp 的didMount中对各个指令进行处理。
MountingManagerCAPI::didMount(MutationList const& mutations) {
...
}
在didMount函数中，先根据预先配置的arkTsComponentNames获取ArkTs组件和CAPI组件的指令，分别进行处理。其中CAPI组件的指令会在handleMutation方法中逐个遍历每个指令，根据指令的类型（Create 、Delete、Insert、Remove、Update）进行不同的处理。
- Create指令：接收到Create指令后，会根据指令的tag、componentName和componentHandle信息创建出一个对应组件类型的ComponentInstance，比如Image组件的Create指令，会创建对应的ImageComponentInstance。创建完组件之后，调用updateComponentWithShadowView方法设置组件的信息。其中，setLayout设置组件的布局信息，setEventEmitter设置组件的事件发送器，setState设置组件的状态，setProps设置组件的属性信息。
- Delete指令：根据接收到的Delete指令的tag，删除对应组件的ComponentInstance。
- Insert指令：根据接收到Insert指令中包含父节点的tag和子节点的tag，将子节点插入到对应的父节点上。
- Remove指令：接收到Remove指令中包含父节点的tag和子节点的tag，在父节点上移除对应的子节点。
- Update指令：接收到Update指令后，调用组件的setLayout、setEventEmitter、setState、setProps更新组件相关信息。
适配层事件分发逻辑
1.适配层事件的注册
当手势触碰屏幕后会命中相应的结点，通过回调发送对应事件，但是需要注册事件，如一个Stack节点注册了NODE_ON_CLICK事件。
StackNode::StackNode()
:ArkUINode(NativeNodeAPi::getInstance()->createNode(ArkUI_NodeType::ARKUI_NODE_STACK)),
m_stackNodeDelegate(nullptr)
{
maybeThrow(NativeNodeApi::getInstance()->registerNodeEvent(m_nodeHandle,NODE_ON_CLICK,0,this));
maybeThrow(NativeNodeApi::getInstance()->registerNodeEvent(m_nodeHandle,NODE_ON_HOVER,0,this));
}
SurfaceTouchEventHandler注册了NODE_TOUCH_EVENT事件。
SurfaceTouchEventHandler(
ComponentInstance::Shared rootView,
ArkTSMessageHub::Shared arkTSMessageHub,int rnInstanceId):
ArkTSMessageHub::Observer(arkTSMessageHub),
m_rootView(std::move(rootView)),
m_rnInstanceId(rnInstanceId)
{
ArkUINodeRegistry::getInstance().registerTouchHandler(
&m_rootView->getLocalRootArkUINode(),this);
NativeNodeApi::getInstance()->registerNodeEvent(
m_rootView->getLocalRootArkUINode().getArkUINodeHandle(),
NODE_TOUCH_EVENT,
NODE_TOUCH_EVENT,
this);
}
2.适配层事件的接收
ArkUINodeRegistry的构造中注册了一个回调，当注册了事件的节点被命中后，该事件通过回调传递处理。
ArkUINodeRegistry::ArkUINodeRegistry(ArkTSBridge::Shared arkTSBridge):m_arkTSBridge(std::move(arkTSBridge))
{
NativeNodeApi::getInstance()->registerNodeEventReceiver(
[](ArkUI_NodeEvent* event){
ArkUINodeRegistry::getInstance().receiveEvent(event)；
});
}
3.适配层事件的处理
回调传递的参数event通过OH_ArkUI_NodeEvent_GetEventType获取事件类型，通过OH_ArkUI_NodeEvent_GetNodeHandle获取触发该事件的结点指针。
auto eventType = OHArkUI_NodeEvent_GetEventType(event);
auto node = OH_ArkUI_NodeEvent_GetNodeHandle(event);
首先判断事件类型是否为Touch事件，如果是，就从一个存储了所有TouchEventHandler的Map中通过结点指针作为key去查找对应的TouchEventHandler，如果没找到，这次Touch事件不处理。
if(eventType == ArkUI_NodeEventType::NODE_TOUCH_EVENT)
{
auto it = m_touchHandlerByNodeHandle.find(node);
if(it == m_touchHandlerByNodeHandle.end())
{
return;
}
}
如果找到了对应的TouchEventHandler，通过OH_ArkUI_NodeEvent_GetInputEvent获取输入事件指针，若输入事件指针不为空，通过OH_ArkUI_UIInputEvent_GetType判断输入事件指针的类型是否为Touch事件，如果不是，这次Touch事件不处理。
auto inputEvent = OH_ArkUI_NodeEvent_GetInputEvent(event);
if(inputEvent == nullptr || OH_ArkUI_UIInputEvent_GetType(inputEvent) != ArkUI_UIInputEvent_Type::ARKUI_UIINPUTEVENT_TYPE_TOUCH)
{
return;
}
如果上述两个条件都满足，就通过TouchEventHandler去处理Touch事件。
it->second->onTouchEvent(inputEvent);
如果事件类型不为Touch事件，就从一个存储了所有ArkUINode的Map中通结点指针作为key去查找对应的ArkUINode，若未找到，这次事件不处理。
auto it = m_nodeByHandle.find(node);
if(it == m_nodeByHandle.end())
{
return;
}
如果找了对应的ArkUINode，通过OH_ArkUI_NodeEvent_GetNodeComponentEvent获取组件事件指针，该指针的data字段保留了arkUI传递过来的参数，并通过ArkUINode处理该事件。
auto commponentEvent = OH_ArkUI_NodeEvent_GetNodeComponentEvent(event);
if(commponentEvent != nullptr)
{
it->second->onNodeEvent(eventType,compenentEvent->data);
return;
}
4.Touch事件的传递给JS侧
上文中写明TouchEventHandler对Touch事件进行处理，以xcomponentSurface举例，xcomponentSurface有一个继承了TouchEventHandler的成员变量，这个成员变量通过dispatchTouchEvent处理这次Touch事件。
void onTouchEvent(ArkUI_UIInputEvent* event)override
{
m_touchEventDispatcher.dispatchTouchEvent(event,m_rootView);
}
对于Touch事件首先通过Touch的位置等因素，获取对应touchTarget（每个componentInstance就是一个touchTarget，下图的名字是eventTarget）。
class ComponentInstance:public TouchTarget,public std::enable_shared_from_this<ComponentInstance>
for(auto const& targetTouches:touchByTargetId)
{
auto it = m_touchTargetByTouchId.find(targetTouches.second.begin()->identifier);
if(it == m_touchTargetByTouchId.end())
{
continue;
}
auto eventTarget = it->second.lock();
if(eventTarget == nullptr)
{
m_touchTargetByTouchId.erase(it);
continue;
}
}
然后通过componentInstance保存的m_eventEmitter发送对应的事件给js侧，从而触发页面的刷新等操作。 Touch事件有以下四种类型:
- UI_TOUCH_EVENT_ACTION_DOWN
- UI_TOUCH_EVENT_ACTION_MOVE
- UI_TOUCH_EVENT_ACTION_UP
- UI_TOUCH_EVENT_ACTION_CANCEL
switch(action)
{
case UI_TOUCH_EVENT_ACTION_DOWN:
eventTarget->getTouchEventEmitter()->onTouchStart(touchEvent);
break;
case UI_TOUCH_EVENT_ACTION_MOVE:
eventTarget->getTouchEventEmitter()->onTouchMove(touchEvent);
break;
case UI_TOUCH_EVENT_ACTION_UP:
eventTarget->getTouchEventEmitter()->onTouchEnd(touchEvent);
break;
case UI_TOUCH_EVENT_ACTION_CANCEL:
default:
eventTarget->getTouchEventEmitter()->onTouchCancel(touchEvent);
break;
}
5、非Touch事件的传递给js侧
上文中写明，非Touch事件由ArkUINode处理，对于每个继承了ArkUINode的类，重载了onNodeEvent方法，以StackNode举例，说明RN适配层是如何区分Click事件和Touch事件。前文说明，StackNode注册了Click事件，所以通过回调，会走到StackNode的onNodeEvent部分，这里会先判断这个事件类型，这里是NODE_ON_CLICK类型，符合要求，但是对于第二个条件eventArgs[3].i32(即上文描述的arkUI传递过来的参数)，如果是触屏手机，其值为2不满足eventArgs[3].i32 ！= 2的条件。
void StackNode::onNodeEvent(ArkUI_NodeEventType eventType,EventArgs& eventArgs)
{
if(eventType == ArkUI_NodeEventType::NODE_ON_CLICK && eventArgs[3].i32 != 2)
{
onClick();
}
if(eventType == ArkUI_NodeEventType::NODE_ON_HOVER)
{
if(m_stackNodeDelegate != nullptr)
{
if(eventArgs[0].i32)
{
m_stackNodeDelegate->onHoverIn();
}else
{
m_stackNodeDelegate->onHoverOut();
}
}
}
}
所以此时实际上不会触发Click的事件，因此Touch事件和Click事件不会冲突。如果触发了Click事件，StackNode会通过代理StackNodeDelegate发送事件。
void StackNode::onClick()
{
if(m_stackNodeDelegate != nullptr)
{
m_stackNodeDelegate->onClick();
}
}
其中ViewComponentInstance继承了StackNodeDelegate，所以实际上走的是ViewComponentInstance的onClick函数。
namespace rnoh
{
class ViewComponentInstance
:public CppComponentInstance<facebook::react::ViewShardowNode>,public StackNodeDelegate
{
}
}
这个函数通过ViewComponentInstance的m_eventEmitter发送事件给JS，从而触发页面的刷新。
void ViewComponentInstance::onClick()
{
if(m_eventEmitter != nullptr)
{
m_eventEmitter->dispatchEvent("click",[=](facebook:jsi::Runtime& runtime)
{auto payload = facebook::jsi::Object(runtime);
return payload;
});
}
}
鸿蒙版React Native启动流程
鸿蒙RN启动阶段分为RN容器创建、Worker线程启动、NAPI方法初始化、RN实例创建四个阶段，接下来加载bundle和界面渲染，类图如下所示：
React Native容器创建
EntryAbility
全局Ability，App的启动入口。
Index.ets
App页面入口。
RNApp.ets
- 配置appKey，和JS侧registerComponent注册的appKey关联；
- 配置初始化参数initialProps，传递给js页面；
- 配置jsBundleProvider，指定bundle加载路径；
- 配置ArkTS混合组件wrappedCustomRNComponentBuilder；
- 配置rnInstanceConfig，指定开发者自定义package，注入字体文件fontResourceByFontFamily，设置BG线程开关，设置C-API开关；
- 持有RNSurface，作为RN页面容器。
RNSurface.ets
RN页面容器，持有XComponent用于挂载ArkUI的C-API节点和响应手势事件。
Worker线程启动
TurboModule运行在worker线程，worker线程是在程序启动时创建。
WorkerThread.ts
EntryAbility创建时会创建RNInstancesCoordinator，RNInstancesCoordinator的构造函数中获取worker线程类地址，然后调用WorkerThread的create方法启动worker线程，如下：
const workerThread = new WorkerThread(logger, new worker.ThreadWorker(scriptUrl, { name: name }), onWorkerError)
RNOHWorker.ets
WorkerThread中配置的scriptUrl即RNOHWorker.ets路径，RNOHWorker.ets内部调用setRNOHWorker.ets的setRNOHWorker方法配置worker线程收发消息通道。
setRNOHWorker.ets
setRNOHWorker方法配置worker线程收发消息通道，createTurboModuleProvider方法注册系统自带和开发者自定义的运行在worker线程的TurboModule。
NAPI方法初始化
- RNOHAppNapiBridge.cpp
Init方法是静态方法，在程序启动时调用，配置了18个ArkTS调用C++的方法，如下：
registerWorkerTurboModuleProvider,
getNextRNInstanceId,
onCreateRNInstance, // 创建RN实例
onDestroyRNInstance, // 销毁RN实例
loadScript, // 加载bundle
startSurface,
stopSurface,
destroySurface,
createSurface, // 创建RN界面
updateSurfaceConstraints,
setSurfaceDisplayMode,
onArkTSMessage,
emitComponentEvent, // 给RN JS发消息
callRNFunction,
onMemoryLevel,
updateState,
getInspectorWrapper,
getNativeNodeIdByTag
- NapiBridge.ts
ArkTS侧RNInstance.ts、SurfaceHandle.ts调用C++的桥梁。
React Native实例创建
在RNInstance.ts中创建RN实例，分为以下步骤：
- 获取RNInstance的id：在RNInstanceRegistry.ets中通过NAPI调用getNextRNInstanceId方法获取。
- 注册ArkTS侧TurboModule：在RNInstance.ts中调用processPackage方法注册系统自带和开发者自定义的运行在UI线程上的TurboModule。
- 注册字体：在RNInstanceFactory.h中调用FontRegistry.h的registerFont方法注册应用侧扩展字体，接着通过图形接口注入字体信息。
- 注册RN官方能力和开发者自定义能力：RNInstanceFactory.h中通过PackageProvider.cpp的getPackage方法获取RN系统自带和开发者自定义TurboModule，接着注册系统View、系统自带TurboModule、开发者自定义View、开发者自定义TurboModule。
- 注册ArkTS混合组件：在RNInstanceFactory.cpp中注册ArkTS侧传递到C++的ArkTS组件。
- 初始化JS引擎：在RNInstanceInternal.cpp中初始化JS引擎Hermes或者JSVM，通过JS引擎驱动JS消息队列。
- 注册TM的JSI通道：在RNInstanceCAPI.cpp中调用createTurboModuleProvider创建TurboModuleProvider，注入__turboModuleProxy对象给JS侧。
- 注入Scheduler：在RNInstanceInternal.cpp中初始化Fabric的Scheduler对象，ReactCommon的组件绘制找到鸿蒙适配层注入的SchedulerDelegate才能进行界面绘制。
- 注册Fabric的JSI通道：在RNInstanceInternal.cpp中调用UIManagerBinding.cpp的createAndInstallIfNeeded方法注入nativeFabricUIManager对象给JS侧。
加载bundle
RN实例创建完毕则开始加载bundle，如下：
ArkTS侧加载bundle、C++侧加载bundle，切线程到ReactCommon的Instance.cpp中加载bundle：
RNApp.ets > RNInstance.ts > RNOHAppNapiBridge.cpp > RNInstanceInternal.cpp > Instance.cpp
总结
本文详细介绍了鸿蒙版 React Native 架构。包括按功能划分的架构组成，如 RN 应用代码、库代码、JSI、React Common、OpenHarmony 适配代码及 OS 代码等。还阐述了 Fabric、TurboModule、线程模型、命令式组件、启动流程等方面内容。启动流程分为 RN 容器创建、Worker 线程启动、NAPI 方法初始化、RN 实例创建及加载 bundle 等阶段。整体架构复杂且功能明确，为开发者提供了在鸿蒙平台上使用 React Native 的技术支持。
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