<script type="text/javascript">
window.onload = function ()
{
    var IMAGE_URL;
    function takeScreenshot(){
        var shareContent = document.getElementById('shareMember');//需要截图的包裹的（原生的）DOM 对象
        var width = shareContent.offsetWidth; //获取dom 宽度
        var height = shareContent.offsetHeight; //获取dom 高度
        var canvas = document.createElement("canvas"); //创建一个canvas节点

        var scale = 1; //定义任意放大倍数 支持小数
        canvas.width = width * scale; //定义canvas 宽度 * 缩放
        canvas.height = height * scale; //定义canvas高度 *缩放
        canvas.getContext("2d").scale(scale, scale); //获取context,设置scale

        //var rect = shareContent.getBoundingClientRect();//获取元素相对于视察的偏移量
        //canvas.getContext("2d").translate(-rect.left, -rect.top);//设置context位置，值为相对于视窗的偏移量负值，让图片复位
        var opts = {
            scale:scale, // 添加的scale 参数
            canvas:canvas, //自定义 canvas
            logging: true, //日志开关
            width:width, //dom 原始宽度
            height:height, //dom 原始高度
            backgroundColor: 'transparent',
        };
        html2canvas(shareContent, opts,{useCORS:true,logging:true}).then(function (canvas)
        {
            IMAGE_URL = canvas.toDataURL("image/png");
            $('.copyImage').attr('src',IMAGE_URL);
        })
    }
    takeScreenshot();
}
</script>