HTML5 Blob与ArrayBufferTypeArray和字符串String之间转换
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1.将String字符串转换成Blob对象
//将字符串 转换成 Blob 对象 var blob = new Blob(["Hello World!"], { type: \'text/plain\' }); console.info(blob); console.info(blob.slice(1, 3, \'text/plain\'));
2.将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(); reader.readAsText(blob, \'utf-8\'); reader.onload = function (e) { console.info(reader.result); //a Hello world! }
ArrayBuffer转Blob
var buffer = new ArrayBuffer(32); var blob = new Blob([buffer]); // 注意必须包裹[]
3,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(); reader.readAsText(blob, \'utf-8\'); reader.onload = function (e) { console.info(reader.result); }
4.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(); reader.readAsArrayBuffer(blob); reader.onload = function (e) { console.info(reader.result); //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(reader.result); //console.info(buf); //将 ArrayBufferView 转换成Blob var buf = new Uint8Array(reader.result); console.info(buf); //[228, 184, 173, 230, 150, 135, 229, 173, 151, 231, 172, 166, 228, 184, 178] reader.readAsText(new Blob([buf]), \'utf-8\'); reader.onload = function () { console.info(reader.result); //中文字符串 }; //将 ArrayBufferView 转换成Blob var buf = new DataView(reader.result); console.info(buf); //DataView {} reader.readAsText(new Blob([buf]), \'utf-8\'); reader.onload = function () { console.info(reader.result); //中文字符串 }; }
关于Blob对象,请参考:http://www.cnblogs.com/tianma3798/p/4293660.html
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