<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<img src="" class="img"/>
<script>
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 ext=img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
var dataUrl=canvas.toDataURL("images/"+ext);
return dataUrl;
};
var img="images/1.png";
var image=new Image();
image.src=img;
image.onload=function(){
var base64=getBase64Image(image);
document.getElementsByClassName("img")[0].setAttribute("src",base64)
}
</script>
</body>
</html>
最终的效果：
