ArrayBuffer 到 base64 编码的字符串 [英] ArrayBuffer to base64 encoded string

问题描述

我需要一种有效的(读取本机)方法将 ArrayBuffer 转换为需要在多部分帖子中使用的 base64 字符串.

I need an efficient (read native) way to convert an ArrayBuffer to a base64 string which needs to be used on a multipart post.

推荐答案

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 );
}

但是，非本地实现更快，例如https://gist.github.com/958841见 http://jsperf.com/encoding-xhr-image-data/6

but, non-native implementations are faster e.g. https://gist.github.com/958841 see http://jsperf.com/encoding-xhr-image-data/6

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