<html>
<head>
<meta charset="UTF-8">
<title>保存文件</title>
<script>
function draw(id){
var c=document.getElementById(id);
if(c==null)
return false;
var cxt=c.getContext("2d");
cxt.fillStyle="aqua";
cxt.fillRect(0,0,c.width,c.height);
cxt.fillStyle="yellow";
cxt.fillRect(10,20,50,50);
window.location=cxt.canvas.toDataURL('img/png');
// var image=c.toDataURL('img.png');
// window.location.href=image;
}
</script>
</head>
<body οnlοad="draw('canvas')">
<canvas id="canvas" width="300" height="200" style="border:1px solid blue;"></canvas>
</body>
</html>
可以看到：黨當前繪製的圖像保存到URL數據中