simple/index.html

<!DOCTYPE html>
<html>

<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        div {
            padding: 20px;
            border: 5px solid black;
        }
        
        h2 {
            background: #efefef;
            margin: 10px;
        }
        
        .toPic {
            display: none;
        }
    </style>
</head>

<body>
    <h2>原始HTML</h2>
    <div style="background:red;width: 600px;" class="test">
        <div style="background:green;">
            <div style="background:blue;">
                <div style="background:yellow;">
                    <div style="background:orange;">
                        33333333333333333333333333333333
                    </div>
                </div>

            </div>

        </div>
    </div>
    <h2 class="toCanvas"> <a href="javascript:void(0);"> 转成canvas </a></h2>
    <h2 class="toPic"><a href="javascript:void(0);"> 转成图片 </a></h2>
    <h5>
        <label for="imgW">宽度:</label>
        <input type="number" value="" id="imgW" placeholder="默认是原图宽度" />
        <label for="imgH">高度:</label>
        <input type="number" value="" id="imgH" placeholder="默认是原图高度" />
        <label for="imgFileName">文件名:</label>
        <input type="text" placeholder="文件名" id="imgFileName" />
        <select id="sel">
                    <option value="png">png</option>
                    <option value="jpeg">jpeg</option>
                    <option value="bmp">bmp</option>
                </select>
        <button id="save">保存</button>
    </h5>
    <script type="text/javascript" src="jquery-3.3.1.js"></script>
    <script type="text/javascript" src="html2canvas.min.js"></script>
    <script type="text/javascript" src="canvas2image.js"></script>
    <script type="text/javascript">
        var test = $(".test").get(0); //将jQuery对象转换为dom对象
        // 点击转成canvas
        $('.toCanvas').click(function(e) {
            // 调用html2canvas插件
            html2canvas(test).then(function(canvas) {
                // canvas宽度
                var canvasWidth = canvas.width;
                // canvas高度
                var canvasHeight = canvas.height;
                // 渲染canvas
                $('.toCanvas').after(canvas);
                // 显示‘转成图片’按钮
                $('.toPic').show(1000);
                // 点击转成图片
                $('.toPic').click(function(e) {
                    // 调用Canvas2Image插件
                    var img = Canvas2Image.convertToImage(canvas, canvasWidth, canvasHeight);
                    // 渲染图片
                    $(".toPic").after(img);
                    // 点击保存
                    $('#save').click(function(e) {
                        let type = $('#sel').val(); //图片类型
                        let w = $('#imgW').val(); //图片宽度
                        let h = $('#imgH').val(); //图片高度
                        let f = $('#imgFileName').val(); //图片文件名
                        w = (w === '') ? canvasWidth : w; //判断输入宽高是否为空，为空时保持原来的值
                        h = (h === '') ? canvasHeight : h;
                        // 调用Canvas2Image插件
                        Canvas2Image.saveAsImage(canvas, w, h, type, f);
                    });
                });


            });
        });
    </script>
</body>

</html>