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ArrayBuffer and Base64
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>ArrayBuffer and Base64</title>
</head>
<body>
<img id="bbf" src="" />
<img id="bbf2" src="" />
<script>
/**
* Base64字符串转成ArrayBuffer数组
* @param {String} base64
*/
function base64ToArrayBuffer(base64) {
var binary_string = window.atob(base64);
var len = binary_string.length;
var bytes = new Uint8Array(len);
for (var i = 0; i < len; i++){
bytes[i] = binary_string.charCodeAt(i);
}
return bytes.buffer;
} /**
* ArrayBuffer数组转成Base64字符串
* @param {ArrayBuffer} buffer
*/
function arrayBufferToBase64(buffer){
var binary = '';
var bytes = new Uint8Array(buffer);
var len = bytes.byteLength;
for (var i = 0; i < len; i++){
binary += String.fromCharCode(bytes[i]);
}
return window.btoa( binary );
} window.onload = function(){
var buff = base64ToArrayBuffer(base64Img.split(',')[1]);
var _blob = new Blob([buff]);
var imageURI = window.URL.createObjectURL(_blob);
var imgobj = document.getElementById("bbf");
imgobj.onload = function(){window.URL.revokeObjectURL(this.src);};//清除释放
imgobj.setAttribute("src", imageURI); var imgobj = document.getElementById("bbf2");
imgobj.setAttribute("src", base64Img);
}
var base64Img = "data:image/gif;base64,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";
</script>
</body>
</html>
