js代码

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge">

<title>pic storage demo</title>

<link rel="stylesheet" href="">

</head>

<body>

<script type="text/javascript" charset="utf-8" >

var src = "20170122161717.png";

function set(key){

var img = document.createElement('img');

img.addEventListener("load",function(){

var imgCanvas = document.createElement("canvas");

imgContext = imgCanvas.getContext("2d");

imgCanvas.width = this.width;

imgCanvas.height = this.height;


imgContext.drawImage(this,0,0,this.width,this.height);


try{

var imgAsDataURL = imgCanvas.toDataURL("image/png");

localStorage.setItem(key,imgAsDataURL);

}catch(e){

console.log("storage failed" + e);

}

},false);


img.src = src;

}



function get(key){

var srcStr = localStorage.getItem(key);

var imgObj = document.createElement('img');

imgObj.src = srcStr;

document.body.appendChild(imgObj);

}

</script>

</body>

</html>

注意:图片和文件要在同一个域内