img标签，获取图片的base64编码
```
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
function getBase64Image(img) {
var canvas = document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, img.width, img.height);
var dataURL = canvas.toDataURL("image/png");
return dataURL;
}
function main() {
var img = document.createElement('img');
// 注意这个图片需要是同源的
img.src = './1.png';
img.onload =function() {
var data = getBase64Image(img);
console.log("图片的base64编码：", data);
}
document.body.appendChild(img);
}
main()
</script>
</body>
</html>
```
本文标题：img标签，获取图片的base64编码
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