img图片转base64

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="jquery-1.8.0.js"></script>
<script src="base64.js"></script>
</head>
<body>
<input type="file" id="file"/>
<img src="https://p1.ssl.qhimg.com/t0151320b1d0fc50be8.png" />
<script>
// var img = document.getElementById("file").files[0].name;
</script>

<script>
var img = "https://p1.ssl.qhimg.com/t0151320b1d0fc50be8.png";
//var img = "http://127.0.0.1/base64/1.jpg";
function getBase64Image(img) {
var canvas = document.createElement("canvas");
document.getElementsByTagName("body")[0].appendChild(canvas);
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, img.width, img.height);
var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
var dataURL = canvas.toDataURL("image/"+ext);
return dataURL;
}
var image = new Image();
image.crossOrigin = '';
image.src = img;
document.getElementsByTagName("body")[0].appendChild(image);
image.onload = function(){
var base64 = getBase64Image(image);
}
</script>
</body>
</html>

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