H5转图片支持保存

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>html2img</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        body {
            position: relative;
        }
        .s_html {
            width: 100%;
            position: relative;
        }
        .s_html img {
            display: block;
        }
        .msg_1 , .msg_2 {
            position: absolute;
            width: 100%;
            box-sizing: border-box;
            height: 60px;
            line-height: 60px;
            text-align: center;
            left: 0;
        }
        .msg_1 {
            bottom: 120px;
            padding: 20px;
        }
        .msg_1 div{
            background: red;
            width: 100%;
        }
        .msg_2 {
            bottom: 188px;
            padding: 20px;
        }
        .msg_2 div {
            background: blue;
            width: 100%;
        }
        .down {
            position: absolute;
            bottom: 80px;
            right: 20px;
            z-index: 1;
            padding: 10px 20px;
            border-radius: 10px;
            background: rgba(0, 0, 0, .6);

        }
    </style>
</head>
<body>
    <div id="s_html" class="s_html">
            <!-- <a class="down" href="" download="downImg">下载</a> -->
        <img width="100%" src="./img/1212.jpg" alt="bg">
        <div class="msg_1" id="msg_1">
            <div>
                lpl <span>总冠军</span>
            </div>

        </div>
        <div class="msg_2" id="msg_2">
            <div>
                IG <span>牛逼</span>
            </div>

        </div>
    </div>
    <!-- <a class="down" id="down" href="" download="downImg">下载</a> -->
</body>
<script src="./js/jquery-3.3.1.js"></script>
<script src="./js/html2canvas.min.js"></script>
<script src="./js/canvas2image.js"></script>
<script>
    // 获取jq转化为dom对象
    var s_html = $('#s_html').get(0);
    // 将html转化成canvas
    html2canvas(s_html).then(function(canvas) {
        // canvas宽度
        var canvasWidth = canvas.width;
        // canvas高度
        var canvasHeight = canvas.height;
        // 清空body
        $('#s_html').html('');
        // 渲染canvas
        $('#s_html').append(canvas);
        // 调用Canvas2Image插件
        var img = Canvas2Image.convertToImage(canvas, canvasWidth, canvasHeight);
        // 清空body
        $('#s_html').html('');
        // 显然img
        $('#s_html').append(img);
        $(img).css({
            "width": $('#s_html').width() + "px",
            "height": 'auto',
            "-webkit-touch-callout":"default"
        })
    })
</script>
</html>

地址https://github.com/TankRyze/html2img