http://blog.liuguofeng.com/wp-content/uploads/2018/09/html2canvas.html

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Using an existing canvas to draw on</title>
    <style>	
        button {
            clear: both;
            display: block;
        }
    </style>
</head>
<body>
<div><h1>这是HTML</h1>
	
    <div id="content" style="width:200px;height:200px;background: rgba(100, 255, 255, 0.5);">
	<img src='timg.jpg' style="width:100px;height:60px;">
	<span>这是文字</span>
	</div>
</div>
<h1>生成的图片</h1>
<canvas width="200" height="200"></canvas>
<script type="text/javascript" src="html2canvas.js"></script>
<button>点击生成图片</button>
<script type="text/javascript">
    var canvas = document.querySelector("canvas");
    document.querySelector("button").addEventListener("click", function() {
        html2canvas(document.querySelector("#content"), {canvas: canvas}).then(function(canvas) {
            console.log('Drew on the existing canvas');
        });
    }, false);
</script>
</body>
</html>

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