js二进制转换

String转换成Blob对象

//将字符串 转换成 Blob 对象
var blob = new Blob(["Hello World!"], {
    type: 'text/plain'
});
(blob);
((1, 3, 'text/plain'));

 

TypeArray转换成 Blob对象  

//将 TypeArray  转换成 Blob 对象
var array = new Uint16Array([97, 32, 72, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100, 33]);
//测试成功
//var blob = new Blob([array], { type: "application/octet-binary" });
//测试成功， 注意必须[]的包裹
var blob = new Blob([array]);
//将 Blob对象 读成字符串
var reader = new FileReader();
(blob, 'utf-8');
 = function (e) {
    (); //a Hello world!
}

 

ArrayBuffer转Blob

var buffer = new ArrayBuffer(32);
var blob = new Blob([buffer]);       // 注意必须包裹[]

 

将Blob对象转换成String字符串，使用FileReader的readAsText方法 

//将字符串转换成 Blob对象
var blob = new Blob(['中文字符串'], {
    type: 'text/plain'
});
//将Blob 对象转换成字符串
var reader = new FileReader();
(blob, 'utf-8');
 = function (e) {
    ();
}

 

将Blob对象转换成ArrayBuffer，使用FileReader的 readAsArrayBuffer方法  

//将字符串转换成 Blob对象
var blob = new Blob(['中文字符串'], {
    type: 'text/plain'
});
//将Blob 对象转换成 ArrayBuffer
var reader = new FileReader();
(blob);
 = function (e) {
    (); //ArrayBuffer {}
    //经常会遇到的异常 Uncaught RangeError: byte length of Int16Array should be a multiple of 2
    //var buf = new int16array();
    //(buf);

    //将 ArrayBufferView  转换成Blob
    var buf = new Uint8Array();
    (buf); //[228, 184, 173, 230, 150, 135, 229, 173, 151, 231, 172, 166, 228, 184, 178]
    (new Blob([buf]), 'utf-8');
     = function () {
        (); //中文字符串
    };

    //将 ArrayBufferView  转换成Blob
    var buf = new DataView();
    (buf); //DataView {}
    (new Blob([buf]), 'utf-8');
     = function () {
        (); //中文字符串
    };
}