js 将页面保存为图片

<!DOCTYPE html>
<html>
<head>
<title>保存为images</title>
<meta charset="utf-8" >
</head>
<body class="Body">
<div class="AllWrap relative">

    <button title="保存为图片" style="position: absolute;top:30px;left:100px;" onclick="saveCanvas()">保 存</button>
    <a href="" download="下载图.png" id="download"></a>

</div>

</body>
<script src="/common/js/util/jquery-1.9.1.min.js"></script>


<script src="https://blog-static.cnblogs.com/files/xieyongbin/html2canvas.min.js"></script>
<script>
    function saveCanvas() {
        html2canvas($(".Body")).then(function(canvas) {
            var imgUri = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
            $("#download").attr("href",imgUri);
            console.log(imgUri);
            document.getElementById("download").click();
        });
    }
</script>
</html>