如何在 Javascript 中将二进制数据读取到字节数组

问题描述

我想用 JavaScript 读取一个二进制文件，该文件将通过 XMLHttpRequest 获取并能够操作该数据.在我的研究中，我发现了这种将二进制文件数据读入数组的方法

I want to read a binary file in JavaScript that would be gotten through XMLHttpRequest and be able to manipulate that data. From my researching I discovered this method of reading a binary file data into an array

var xhr = new XMLHttpRequest();
xhr.open('GET', '/binary_And_Ascii_File.obj', true);

xhr.responseType = 'arraybuffer';

xhr.onload = function(e) {
  var uInt8Array = new Uint8Array(this.response);
};

如何将此二进制数据数组转换为人类可读的字符串?

How do I convert this binary data array to a human-readable-string?

推荐答案

我相信你会发现这很有帮助:http://jsdo.it/tsmallfield/uint8array.

I'm sure you will find this helpful: http://jsdo.it/tsmallfield/uint8array.

点击 javascript 标签.将出现将 Uint8Array 转换为字符串的代码.作者展示了2种方法:

Click on javascript tab. There will appear the code to convert the Uint8Array in a string. The author shows 2 method:

• 首先是关于创建视图.
• 第二个偏移字节.

报告代码的完整性

var buffer = new ArrayBuffer( res.length ), // res is this.response in your case
    view   = new Uint8Array( buffer ),
    len    = view.length,
    fromCharCode = String.fromCharCode,
    i, s, str;    

/**
 *  1) 8bitの配列に入れて上位ビットけずる
 */
str = "";

for ( i = len; i--; ) {
  view[i] = res[i].charCodeAt(0);
}

for ( i = 0; i < len; ++i ) {
  str += fromCharCode( view[i] );
}    

/**
 *  2) & 0xff で上位ビットけずる
 */
str = "";

for ( i = 0; i < len; ++i ) {
  str += fromCharCode( res[i].charCodeAt(0) & 0xff );
}

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