把二进制数据，并保存为一个.mp3文件的Javascript
所以我有一个Node.js脚本和一个Javascript文件相互通信，除了Node.js应该返回一个.mp3文件的数据。
数据是二进制的，它看起来像胡言乱语，我将如何把它返回的数据，并允许用户使用JavaScript下载它的网页？
http.responseText ，它使用http.responseText获取数据。
Node.js代码
//initilization var querystring = require('querystring'); var http = require('http'); var url = require('url'); var fileSystem = require('fs'); var path = require('path'); var util = require('util'); //convert function function convert(voiceToUse, textToConvert, response) { console.log("Sending Convert Request..."); //data to send as a query var data = querystring.stringify( { username: 'user', password: 'pass', action: 'convert', voice: voiceToUse, text: textToConvert }); //options to use var options = { host: 'ws.ispeech.org', port: 80, path: '/api/rest/1.5', method: 'POST', headers: { 'Content-Type': 'application/x-www-form-urlencoded', 'Content-Length': data.length } }; //http post request var req = http.request(options, function (res) { res.setEncoding('utf8'); res.on('data', function (chunk) { console.log("Body: " + chunk); var fileId = chunk.substr(chunk.indexOf("fileid") + 7); console.log("Converting File..."); download(fileId.substr(0, fileId.search("&")), response); }); }); req.on('error', function (e) { console.log('problem with request: ' + e.message); }); req.write(data); req.end(); } //download function function download(id, response) { //data to send as a query var data = querystring.stringify( { username: 'user', password: 'pass', action: 'download', fileid: id }); //options to use var options = { host: 'ws.ispeech.org', port: 80, path: '/api/rest/1.5', method: 'POST', headers: { 'Content-Type': 'application/x-www-form-urlencoded', 'Content-Length': data.length } }; //http post request var req = http.request(options, function (res) { res.on('data', function (chunk) { if (JSON.stringify(res.headers).indexOf("audio/mp3") != -1) { console.log("Downloading Chunk..."); /*var fs = require('fs'), str = 'string to append to file'; fs.open('test.mp3', 'a', 666, function (e, id) { fs.write(id, chunk, 0, chunk.length, 0, function () { fs.close(id, function () { }); }); });*/ response.write(chunk, "binary"); } else { download(id, response); } }); res.on('end', function () { if (JSON.stringify(res.headers).indexOf("audio/mp3") != -1){ response.end(); } }); }); req.on('error', function (e) { console.log('problem with request: ' + e.message); }); req.write(data); req.end(); } http = require('http'); fs = require('fs'); server = http.createServer( function(req, res) { console.dir(req.param); if (req.method == 'POST') { console.log("POST"); var body = ''; req.on('data', function (data) { body += data; console.log("Partial body: " + body); }); req.on('end', function () { console.log("Body: " + body); if(body){ convert('engfemale1', body, res); res.writeHead(200, { 'Content-Type': 'audio/mp3', 'Content-Disposition': 'attachment; filename="tts.mp3"' }); } }); } }); port = 8080; server.listen(port); console.log('Listening at port ' + port);
Javascript代码
console.log('begin'); var http = new XMLHttpRequest(); var params = "text=" + bodyText; http.open("POST", "http://supersecretserver:8080", true); http.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); //http.setRequestHeader("Content-length", params.length); //http.setRequestHeader("Connection", "close"); http.onreadystatechange = function() { console.log('onreadystatechange'); if (http.readyState == 4 && http.status == 200) { alert(http.responseText);//response text is binary mp3 data } else { console.log('readyState=' + http.readyState + ', status: ' + http.status); } } console.log('sending...') http.send(params); console.log('end');
您可以尝试使用数据url：
<a href="data:audio/mpeg3;charset=utf-8;base64,Zm9vIGJhcg==">mp3 download</a>
不是最好的浏览器支持。
也可以直接在audio标签中使用数据url。
一个更好的解决scheme是将MP3保存到服务器的某个地方，并返回一个链接，供MP3播放器使用。