剛接觸微信小程式開發，自己閒來無事做的一個音樂播放器。大概介紹一下其中使用的哪些東西。由於QQ音樂要求請求頭中必須包含Referer這個設定（Referer：代表你是從哪個頁面傳送的請求）才能正確的響應資料，然而微信小程式的網路請求wx.request規定不能在請求頭中設定Referer，所以導致不能直接從小程式中去呼叫QQ音樂的介面。為了解決這個問題，開始我想採用java來做一個後臺代理（就是給請求加上請求頭），但是考慮到一個原因，java的服務佔用記憶體比較大相對來說要重量一點。通過了解採用node.js來做這個功能再合適不過。於是就採用了node.js，搭建服務快，省去了java服務需要的很多配置。
node程式碼：

var express = require('express');
var request = require("request");
var app = express();

//獲取推薦歌單列表
app.get('/haicome/getQMusicSongSheet', function (req, res) {
    const url = "https://c.y.qq.com/splcloud/fcgi-bin/fcg_get_diss_by_tag.fcg?" +
        "picmid=1&rnd=0.9948304561071419&g_tk=5381&jsonpCallback=getPlaylist&loginUin=0"
 
 +
        "&hostUin=0&format=jsonp&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq&" +
        "needNewCode=0&categoryId=10000000&sortId=2&sin=0&ein=29"
    var options = {
        url: url,
        headers: {
            referer: 'https://y.qq.com/portal/playlist.html'
 

        }
    };
    request(options, function (error, response, body) {
        var jsonResult = body.substring(body.indexOf("(")+1,body.length-1);
        res.send(jsonResult);
    })
});

//獲取要播放的歌單的詳情
app.get('/haicome/getQMusicSongSheetDetail', function (req, res) {
    const dissid = req.query.dissid;
    const url = "https://c.y.qq.com/qzone/fcg-bin/fcg_ucc_getcdinfo_byids_cp.fcg?" +
        "type=1&json=1&utf8=1&onlysong=0&disstid="+dissid +
        "&format=jsonp&g_tk=5381&jsonpCallback=playlistinfoCallback&loginUin=0&hostUin=0&" +
        "format=jsonp&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq&needNewCode=0"
    var options = {
        url: url,
        headers: {
            referer: 'https://y.qq.com/portal/playlist.html'
        }
    };
    request(options, function (error, response, body) {
        var jsonResult = body.substring(body.indexOf("(")+1,body.length-1);
        res.send(jsonResult);
    })
});

//獲取指定歌曲資訊
app.get('/haicome/getQMusicSongByAlbummid', function (req, res) {
    const albummid = req.query.albummid;
    const url = "https://c.y.qq.com/v8/fcg-bin/fcg_v8_album_info_cp.fcg?" +
        "albummid="+albummid +
        "&g_tk=5381&jsonpCallback=albuminfoCallback&loginUin=0&hostUin=0&" +
        "format=jsonp&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq&needNewCode=0"
    var options = {
        url: url,
        headers: {
            referer: 'https://y.qq.com/portal/playlist.html'
        }
    };
    request(options, function (error, response, body) {
        var jsonResult = body.substring(body.indexOf("(")+1,body.length-1);
        res.send(jsonResult);
    })
});

//獲取指定歌曲vkey  這個vkey在獲取資源的時候需要使用
app.get('/haicome/getQMusicSongVkeyById', function (req, res) {
    const id = req.query.id;
    const url = "https://c.y.qq.com/base/fcgi-bin/fcg_music_express_mobile3.fcg?" +
        "g_tk=5381&jsonpCallback=MusicJsonCallback8307607419317575&loginUin=0&hostUin=0&" +
        "format=json&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq&needNewCode=0&" +
        "cid=205361747&callback=MusicJsonCallback8307607419317575&uin=0&songmid="+id+"&filename=C400"+id+".m4a&guid=890047478"
    var options = {
        url: url,
        headers: {
            referer: 'https://y.qq.com/portal/playlist.html'
        }
    };
    request(options, function (error, response, body) {
        const result = JSON.stringify(body);
        const key = result.substring(result.indexOf("vkey")+9,result.length-8) ;
        res.send(key);
    })
});

//查詢歌單
app.get('/haicome/getQMusicSongSearchList', function (req, res) {
    var search = req.query.search;
    search = encodeURIComponent(search);
    console.log(search);
    const url = "https://c.y.qq.com/soso/fcgi-bin/client_music_search_songlist?" +
        "remoteplace=txt.yqq.playlist&searchid=111594735142470005&flag_qc=0&page_no=0&num_per_page=50" +
        "&query="+search +
        "&g_tk=5381&jsonpCallback=MusicJsonCallback321112164733657&loginUin=0&hostUin=0&format=jsonp" +
        "&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq&needNewCode=0"
    console.log(url);
    var options = {
        url: url,
        headers: {
            referer: 'https://y.qq.com/portal/playlist.html',
            contentType:'application/x-javascript;charset=utf-8',
            vary:'Accept-Encoding'
        }
    };
    request(options, function (error, response, body) {
        var jsonResult = body.substring(body.indexOf("(")+1,body.length-1);
        console.log(jsonResult);
        res.send(jsonResult);
    })
});

app.listen(8088, function () {
    console.log('Example app listening on port 8088!');
});