wxml

  1. <!-- 数据源 -->
  2. <view class='item-{{index}}' wx:for="{{lazyData}}" wx:key="*this.src">
  3. <image src='{{item.show? item.src : loadIcon}}' class='{{item.show? "active" : ""}}'></image>
  4. <view>a-{{index}}</view>
  5. </view>

js

  1. Page({
  2. data: {
  3. lazyData: [{
  4. src: "https://gtd.alicdn.com/sns_logo/i1/TB124_3NXXXXXasXVXXSutbFXXX.jpg_240x240xz.jpg",
  5.  
  6. },
  7. {
  8. src: "https://gtd.alicdn.com/sns_logo/i7/TB1IWtgQFXXXXcmXFXXSutbFXXX.jpg_240x240xz.jpg",
  9.  
  10. },
  11. {
  12. src: "https://gtd.alicdn.com/sns_logo/i1/TB1_f_PLXXXXXbVXpXXSutbFXXX.jpg_240x240xz.jpg",
  13.  
  14. },
  15. {
  16. src: "https://gtd.alicdn.com/sns_logo/i1/TB1DX3hIpXXXXXIaXXXSutbFXXX.jpg_240x240xz.jpg",
  17.  
  18. },
  19. {
  20. src: "https://gtd.alicdn.com/sns_logo/i6/TB1SIYrLXXXXXaAXpXXSutbFXXX.jpg_240x240xz.jpg",
  21.  
  22. },
  23. {
  24. src: "https://gtd.alicdn.com/sns_logo/i1/TB11yxeNVXXXXbwXFXXSutbFXXX.jpg_240x240xz.jpg",
  25.  
  26. },
  27. {
  28. src: "https://gtd.alicdn.com/sns_logo/i3/TB1ndJiQFXXXXctaXXXSutbFXXX.jpg_240x240xz.jpg",
  29.  
  30. },
  31. {
  32. src: "https://gtd.alicdn.com/sns_logo/i4/TB1BYGDLpXXXXbuXXXXSutbFXXX.jpg_240x240xz.jpg",
  33.  
  34. },
  35. {
  36. src: "https://gtd.alicdn.com/sns_logo/i2/TB1_9GoMVXXXXXmaXXXSutbFXXX.jpg_240x240xz.jpg",
  37.  
  38. },
  39. {
  40. src: "https://gtd.alicdn.com/sns_logo/i2/TB1cSZZNFXXXXaKaXXXSutbFXXX.jpg_240x240xz.jpg",
  41.  
  42. },
  43. {
  44. src: "https://gtd.alicdn.com/sns_logo/i4/TB1MwqbLpXXXXaEXpXXSutbFXXX.jpg_240x240xz.jpg",
  45.  
  46. },
  47. {
  48. src: "https://gtd.alicdn.com/sns_logo/i8/TB1RVS_QpXXXXXBXXXXSutbFXXX.jpg_240x240xz.jpg",
  49.  
  50. },
  51. {
  52. src: "https://gtd.alicdn.com/sns_logo/i5/TB1xEJiLXXXXXcxaXXXSutbFXXX.jpg_240x240xz.jpg",
  53.  
  54. },
  55. {
  56. src: "https://gtd.alicdn.com/sns_logo/i6/TB1DSuHJVXXXXXmXXXXwu0bFXXX.png_240x240xz.jpg",
  57.  
  58. },
  59. {
  60. src: "https://gtd.alicdn.com/sns_logo/i5/TB1aMNyLpXXXXa2XXXXSutbFXXX.jpg_240x240xz.jpg",
  61.  
  62. },
  63. {
  64. src: "https://gtd.alicdn.com/sns_logo/i8/TB1JRHEQpXXXXXwXVXXSutbFXXX.jpg_240x240xz.jpg",
  65.  
  66. },
  67. {
  68. src: "https://gtd.alicdn.com/sns_logo/i7/TB1qKEuQpXXXXXYXXXXSutbFXXX.jpg_240x240xz.jpg",
  69.  
  70. },
  71. {
  72. src: "https://gtd.alicdn.com/sns_logo/i7/TB1TlOfQFXXXXX2XXXXwu0bFXXX.png_240x240xz.jpg",
  73.  
  74. },
  75. {
  76. src: "https://gtd.alicdn.com/sns_logo/i1/TB1SKu.QpXXXXbDXVXXSutbFXXX.jpg_240x240xz.jpg",
  77.  
  78. },
  79. {
  80. src: "https://gtd.alicdn.com/sns_logo/i2/TB17gJ3OXXXXXcrXpXXSutbFXXX.jpg_240x240xz.jpg",
  81.  
  82. },
  83. {
  84. src: "https://gtd.alicdn.com/sns_logo/i8/TB1um5GQpXXXXbiaXXXSutbFXXX.jpg_240x240xz.jpg",
  85.  
  86. },
  87. {
  88. src: "https://gtd.alicdn.com/sns_logo/i1/TB1pxCTQpXXXXa2apXXSutbFXXX.jpg_240x240xz.jpg",
  89.  
  90. },
  91. {
  92. src: "https://gtd.alicdn.com/sns_logo/i6/TB1zksMNVXXXXaRapXXSutbFXXX.jpg_240x240xz.jpg",
  93.  
  94. },
  95. {
  96. src: "https://gtd.alicdn.com/sns_logo/i4/TB1nbrcOXXXXXXEXpXXSutbFXXX.jpg_240x240xz.jpg",
  97.  
  98. },
  99. {
  100. src: "https://gtd.alicdn.com/sns_logo/i4/TB1CI_NQpXXXXXaXVXXSutbFXXX.jpg_240x240xz.jpg",
  101.  
  102. },
  103. {
  104. src: "https://gtd.alicdn.com/sns_logo/i2/TB18vTdQFXXXXXlXpXXwu0bFXXX.png_240x240xz.jpg",
  105.  
  106. },
  107. {
  108. src: "https://gtd.alicdn.com/sns_logo/i7/TB1doDVQpXXXXcRaXXXSutbFXXX.jpg_240x240xz.jpg",
  109.  
  110. },
  111. {
  112. src: "https://gtd.alicdn.com/sns_logo/i1/TB17LgBNFXXXXaSXVXXSutbFXXX.jpg_240x240xz.jpg",
  113.  
  114. },
  115. {
  116. src: "https://gtd.alicdn.com/sns_logo/i6/TB1fVJJQFXXXXcyXpXXSutbFXXX.jpg_240x240xz.jpg",
  117.  
  118. },
  119. {
  120. src: "https://gtd.alicdn.com/sns_logo/i3/TB1wnBTKFXXXXcQXXXXSutbFXXX.jpg_240x240xz.jpg",
  121.  
  122. },
  123. {
  124. src: "https://gtd.alicdn.com/sns_logo/i1/TB124_3NXXXXXasXVXXSutbFXXX.jpg_240x240xz.jpg",
  125.  
  126. },
  127. {
  128. src: "https://gtd.alicdn.com/sns_logo/i7/TB1IWtgQFXXXXcmXFXXSutbFXXX.jpg_240x240xz.jpg",
  129.  
  130. },
  131. {
  132. src: "https://gtd.alicdn.com/sns_logo/i1/TB1_f_PLXXXXXbVXpXXSutbFXXX.jpg_240x240xz.jpg",
  133.  
  134. },
  135. {
  136. src: "https://gtd.alicdn.com/sns_logo/i1/TB1DX3hIpXXXXXIaXXXSutbFXXX.jpg_240x240xz.jpg",
  137.  
  138. },
  139. {
  140. src: "https://gtd.alicdn.com/sns_logo/i6/TB1SIYrLXXXXXaAXpXXSutbFXXX.jpg_240x240xz.jpg",
  141.  
  142. },
  143. {
  144. src: "https://gtd.alicdn.com/sns_logo/i1/TB11yxeNVXXXXbwXFXXSutbFXXX.jpg_240x240xz.jpg",
  145.  
  146. },
  147. {
  148. src: "https://gtd.alicdn.com/sns_logo/i3/TB1ndJiQFXXXXctaXXXSutbFXXX.jpg_240x240xz.jpg",
  149.  
  150. },
  151. {
  152. src: "https://gtd.alicdn.com/sns_logo/i4/TB1BYGDLpXXXXbuXXXXSutbFXXX.jpg_240x240xz.jpg",
  153.  
  154. },
  155. {
  156. src: "https://gtd.alicdn.com/sns_logo/i2/TB1_9GoMVXXXXXmaXXXSutbFXXX.jpg_240x240xz.jpg",
  157.  
  158. },
  159. {
  160. src: "https://gtd.alicdn.com/sns_logo/i2/TB1cSZZNFXXXXaKaXXXSutbFXXX.jpg_240x240xz.jpg",
  161.  
  162. },
  163. {
  164. src: "https://gtd.alicdn.com/sns_logo/i4/TB1MwqbLpXXXXaEXpXXSutbFXXX.jpg_240x240xz.jpg",
  165.  
  166. },
  167. {
  168. src: "https://gtd.alicdn.com/sns_logo/i8/TB1RVS_QpXXXXXBXXXXSutbFXXX.jpg_240x240xz.jpg",
  169.  
  170. },
  171. {
  172. src: "https://gtd.alicdn.com/sns_logo/i5/TB1xEJiLXXXXXcxaXXXSutbFXXX.jpg_240x240xz.jpg",
  173.  
  174. },
  175. {
  176. src: "https://gtd.alicdn.com/sns_logo/i6/TB1DSuHJVXXXXXmXXXXwu0bFXXX.png_240x240xz.jpg",
  177.  
  178. },
  179. {
  180. src: "https://gtd.alicdn.com/sns_logo/i5/TB1aMNyLpXXXXa2XXXXSutbFXXX.jpg_240x240xz.jpg",
  181.  
  182. },
  183. {
  184. src: "https://gtd.alicdn.com/sns_logo/i8/TB1JRHEQpXXXXXwXVXXSutbFXXX.jpg_240x240xz.jpg",
  185.  
  186. },
  187. {
  188. src: "https://gtd.alicdn.com/sns_logo/i7/TB1qKEuQpXXXXXYXXXXSutbFXXX.jpg_240x240xz.jpg",
  189.  
  190. },
  191. {
  192. src: "https://gtd.alicdn.com/sns_logo/i7/TB1TlOfQFXXXXX2XXXXwu0bFXXX.png_240x240xz.jpg",
  193.  
  194. },
  195. {
  196. src: "https://gtd.alicdn.com/sns_logo/i1/TB1SKu.QpXXXXbDXVXXSutbFXXX.jpg_240x240xz.jpg",
  197.  
  198. },
  199. {
  200. src: "https://gtd.alicdn.com/sns_logo/i2/TB17gJ3OXXXXXcrXpXXSutbFXXX.jpg_240x240xz.jpg",
  201.  
  202. },
  203. {
  204. src: "https://gtd.alicdn.com/sns_logo/i8/TB1um5GQpXXXXbiaXXXSutbFXXX.jpg_240x240xz.jpg",
  205.  
  206. },
  207. {
  208. src: "https://gtd.alicdn.com/sns_logo/i1/TB1pxCTQpXXXXa2apXXSutbFXXX.jpg_240x240xz.jpg",
  209.  
  210. },
  211. {
  212. src: "https://gtd.alicdn.com/sns_logo/i6/TB1zksMNVXXXXaRapXXSutbFXXX.jpg_240x240xz.jpg",
  213.  
  214. },
  215. {
  216. src: "https://gtd.alicdn.com/sns_logo/i4/TB1nbrcOXXXXXXEXpXXSutbFXXX.jpg_240x240xz.jpg",
  217.  
  218. },
  219. {
  220. src: "https://gtd.alicdn.com/sns_logo/i4/TB1CI_NQpXXXXXaXVXXSutbFXXX.jpg_240x240xz.jpg",
  221.  
  222. },
  223. {
  224. src: "https://gtd.alicdn.com/sns_logo/i2/TB18vTdQFXXXXXlXpXXwu0bFXXX.png_240x240xz.jpg",
  225.  
  226. },
  227. {
  228. src: "https://gtd.alicdn.com/sns_logo/i7/TB1doDVQpXXXXcRaXXXSutbFXXX.jpg_240x240xz.jpg",
  229.  
  230. },
  231. {
  232. src: "https://gtd.alicdn.com/sns_logo/i1/TB17LgBNFXXXXaSXVXXSutbFXXX.jpg_240x240xz.jpg",
  233.  
  234. },
  235. {
  236. src: "https://gtd.alicdn.com/sns_logo/i6/TB1fVJJQFXXXXcyXpXXSutbFXXX.jpg_240x240xz.jpg",
  237.  
  238. }
  239. ]
  240. },
  241. onLoad: function() {
  242. /**
  243. * this - 当前对象
  244. * this.data.lazyData - 数据源
  245. * lazy_name - 数据名
  246. * 加载图标 - https://img.alicdn.com/tps/i3/T1QYOyXqRaXXaY1rfd-32-32.gif
  247. */
  248. lazyImg(this, this.data.lazyData, 'lazyData', 'https://img.alicdn.com/tps/i3/T1QYOyXqRaXXaY1rfd-32-32.gif')
  249. }
  250. })
  251.  
  252. /**
  253. * 数据名必须为:lazyData或其它名(与数据以及页面相同)
  254. *
  255. * 模拟数据:lazyData
  256. * 传输数据:_that,data(this,lazyData,lazy_name,loading_icon)
  257. */
  258. const lazyImg = (_that, data, lazy_name, loading_icon) => {
  259. for (let i = 0, len = data.length; i < len; i++) {
  260. wx.createIntersectionObserver().relativeToViewport({
  261. bottom: 20
  262. }).observe('.item-' + i, (ret) => {
  263. ret.intersectionRatio > 0 ? data[i].show = true : '';
  264. _that.setData({
  265. [lazy_name]: data,
  266. loadIcon: loading_icon
  267. })
  268. })
  269. }
  270. }

  

微信官方API:wx.createIntersectionObserver ,感兴趣的可以去看看

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