项目根目录
  srcipts
    copyPrelaunch.js
  src
    prelaunch.js 
    
copyPrelaunch.js 文件
const fs = require('fs');
// 具体路径自定义
const path = require('path');
fs.copyFileSync(path.join(__dirname, '../src/prelaunch.js'), path.join(__dirname, '../dist/build/mp-toutiao/prelaunch.js'));


package.json文件
  "scripts": {
       "genPrelaunch": "node ./scripts/copyPrelaunch.js",
       "build:mp-toutiao": "... && npm run genPrelaunch", 
  }

registerOnPrelaunch(path: string, callback: (params: { path: string, query:string}) => {
})
registerOnPrelaunch('app', callback); // 任意页面首次启动都会执行
registerOnPrelaunch(path, callback); // 特定页面首次启动都会执行

registerOnPrelaunch('xxx',callback: (params: {path: string, query: string})=>{
// path 启动页路径
// query 启动页参数
    tt.request({
        url:url,
        id: 'id_test', // 唯一id，必须与消费时相同，自定义一个字符串即可,用于标识是一个需要复用的请求，
        // id和url相同的两个请求会复用
        xxx，其余request参数
    })；
});

tt.request({
    id: 'id_test', // 必须与触发时相同，
    usePrefetchCache: true，// 必须为true
    xxx，其余request参数
})；

var t=t||function(t,n){var r;if("undefined"!=typeof window&&window.crypto&&(r=window.crypto),"undefined"!=typeof self&&self.crypto&&(r=self.crypto),"undefined"!=typeof globalThis&&globalThis.crypto&&(r=globalThis.crypto),!r&&"undefined"!=typeof window&&window.msCrypto&&(r=window.msCrypto),!r&&"undefined"!=typeof global&&global.crypto&&(r=global.crypto),!r&&"function"==typeof require)try{r=require("crypto")}catch(t){}var e=function(){if(r){if("function"==typeof r.getRandomValues)try{return r.getRandomValues(new Uint32Array(1))[0]}catch(t){}if("function"==typeof r.randomBytes)try{return r.randomBytes(4).readInt32LE()}catch(t){}}throw new Error("Native crypto module could not be used to get secure random number.")},i=Object.create||function(){function t(){}return function(n){var r;return t.prototype=n,r=new t,t.prototype=null,r}}(),o={},s=o.lib={},a=s.Base={extend:function(t){var n=i(this);return t&&n.mixIn(t),n.hasOwnProperty("init")&&this.init!==n.init||(n.init=function(){n.$super.init.apply(this,arguments)}),n.init.prototype=n,n.$super=this,n},create:function(){var t=this.extend();return t.init.apply(t,arguments),t},init:function(){},mixIn:function(t){for(var n in t)t.hasOwnProperty(n)&&(this[n]=t[n]);t.hasOwnProperty("toString")&&(this.toString=t.toString)},clone:function(){return this.init.prototype.extend(this)}},c=s.WordArray=a.extend({init:function(t,n){t=this.words=t||[],this.sigBytes=null!=n?n:4*t.length},toString:function(t){return(t||f).stringify(this)},concat:function(t){var n=this.words,r=t.words,e=this.sigBytes,i=t.sigBytes;if(this.clamp(),e%4)for(var o=0;o<i;o++){var s=r[o>>>2]>>>24-o%4*8&255;n[e+o>>>2]|=s<<24-(e+o)%4*8}else for(var a=0;a<i;a+=4)n[e+a>>>2]=r[a>>>2];return this.sigBytes+=i,this},clamp:function(){var n=this.words,r=this.sigBytes;n[r>>>2]&=4294967295<<32-r%4*8,n.length=t.ceil(r/4)},clone:function(){var t=a.clone.call(this);return t.words=this.words.slice(0),t},random:function(t){for(var n=[],r=0;r<t;r+=4)n.push(e());return new c.init(n,t)}}),u=o.enc={},f=u.Hex={stringify:function(t){for(var n=t.words,r=t.sigBytes,e=[],i=0;i<r;i++){var o=n[i>>>2]>>>24-i%4*8&255;e.push((o>>>4).toString(16)),e.push((15&o).toString(16))}return e.join("")},parse:function(t){for(var n=t.length,r=[],e=0;e<n;e+=2)r[e>>>3]|=parseInt(t.substr(e,2),16)<<24-e%8*4;return new c.init(r,n/2)}},h=u.Latin1={stringify:function(t){for(var n=t.words,r=t.sigBytes,e=[],i=0;i<r;i++){var o=n[i>>>2]>>>24-i%4*8&255;e.push(String.fromCharCode(o))}return e.join("")},parse:function(t){for(var n=t.length,r=[],e=0;e<n;e++)r[e>>>2]|=(255&t.charCodeAt(e))<<24-e%4*8;return new c.init(r,n)}},l=u.Utf8={stringify:function(t){try{return decodeURIComponent(escape(h.stringify(t)))}catch(t){throw new Error("Malformed UTF-8 data")}},parse:function(t){return h.parse(unescape(encodeURIComponent(t)))}},d=s.BufferedBlockAlgorithm=a.extend({reset:function(){this._data=new c.init,this._nDataBytes=0},_append:function(t){"string"==typeof t&&(t=l.parse(t)),this._data.concat(t),this._nDataBytes+=t.sigBytes},_process:function(n){var r,e=this._data,i=e.words,o=e.sigBytes,s=this.blockSize,a=o/(4*s),u=(a=n?t.ceil(a):t.max((0|a)-this._minBufferSize,0))*s,f=t.min(4*u,o);if(u){for(var h=0;h<u;h+=s)this._doProcessBlock(i,h);r=i.splice(0,u),e.sigBytes-=f}return new c.init(r,f)},clone:function(){var t=a.clone.call(this);return t._data=this._data.clone(),t},_minBufferSize:0}),p=(s.Hasher=d.extend({cfg:a.extend(),init:function(t){this.cfg=this.cfg.extend(t),this.reset()},reset:function(){d.reset.call(this),this._doReset()},update:function(t){return this._append(t),this._process(),this},finalize:function(t){return t&&this._append(t),this._doFinalize()},blockSize:16,_createHelper:function(t){return function(n,r){return new t.init(r).finalize(n)}},_createHmacHelper:function(t){return function(n,r){return new p.HMAC.init(t,r).finalize(n)}}}),o.algo={});return o}(Math);!function(n){var r=t,e=r.lib,i=e.WordArray,o=e.Hasher,s=r.algo,a=[];!function(){for(var t=0;t<64;t++)a[t]=4294967296*n.abs(n.sin(t+1))|0}();var c=s.MD5=o.extend({_doReset:function(){this._hash=new i.init([1732584193,4023233417,2562383102,271733878])},_doProcessBlock:function(t,n){for(var r=0;r<16;r++){var e=n+r,i=t[e];t[e]=16711935&(i<<8|i>>>24)|4278255360&(i<<24|i>>>8)}var o=this._hash.words,s=t[n+0],c=t[n+1],d=t[n+2],p=t[n+3],y=t[n+4],g=t[n+5],w=t[n+6],v=t[n+7],_=t[n+8],m=t[n+9],B=t[n+10],b=t[n+11],x=t[n+12],H=t[n+13],S=t[n+14],z=t[n+15],C=o[0],M=o[1],A=o[2],D=o[3];C=u(C,M,A,D,s,7,a[0]),D=u(D,C,M,A,c,12,a[1]),A=u(A,D,C,M,d,17,a[2]),M=u(M,A,D,C,p,22,a[3]),C=u(C,M,A,D,y,7,a[4]),D=u(D,C,M,A,g,12,a[5]),A=u(A,D,C,M,w,17,a[6]),M=u(M,A,D,C,v,22,a[7]),C=u(C,M,A,D,_,7,a[8]),D=u(D,C,M,A,m,12,a[9]),A=u(A,D,C,M,B,17,a[10]),M=u(M,A,D,C,b,22,a[11]),C=u(C,M,A,D,x,7,a[12]),D=u(D,C,M,A,H,12,a[13]),A=u(A,D,C,M,S,17,a[14]),C=f(C,M=u(M,A,D,C,z,22,a[15]),A,D,c,5,a[16]),D=f(D,C,M,A,w,9,a[17]),A=f(A,D,C,M,b,14,a[18]),M=f(M,A,D,C,s,20,a[19]),C=f(C,M,A,D,g,5,a[20]),D=f(D,C,M,A,B,9,a[21]),A=f(A,D,C,M,z,14,a[22]),M=f(M,A,D,C,y,20,a[23]),C=f(C,M,A,D,m,5,a[24]),D=f(D,C,M,A,S,9,a[25]),A=f(A,D,C,M,p,14,a[26]),M=f(M,A,D,C,_,20,a[27]),C=f(C,M,A,D,H,5,a[28]),D=f(D,C,M,A,d,9,a[29]),A=f(A,D,C,M,v,14,a[30]),C=h(C,M=f(M,A,D,C,x,20,a[31]),A,D,g,4,a[32]),D=h(D,C,M,A,_,11,a[33]),A=h(A,D,C,M,b,16,a[34]),M=h(M,A,D,C,S,23,a[35]),C=h(C,M,A,D,c,4,a[36]),D=h(D,C,M,A,y,11,a[37]),A=h(A,D,C,M,v,16,a[38]),M=h(M,A,D,C,B,23,a[39]),C=h(C,M,A,D,H,4,a[40]),D=h(D,C,M,A,s,11,a[41]),A=h(A,D,C,M,p,16,a[42]),M=h(M,A,D,C,w,23,a[43]),C=h(C,M,A,D,m,4,a[44]),D=h(D,C,M,A,x,11,a[45]),A=h(A,D,C,M,z,16,a[46]),C=l(C,M=h(M,A,D,C,d,23,a[47]),A,D,s,6,a[48]),D=l(D,C,M,A,v,10,a[49]),A=l(A,D,C,M,S,15,a[50]),M=l(M,A,D,C,g,21,a[51]),C=l(C,M,A,D,x,6,a[52]),D=l(D,C,M,A,p,10,a[53]),A=l(A,D,C,M,B,15,a[54]),M=l(M,A,D,C,c,21,a[55]),C=l(C,M,A,D,_,6,a[56]),D=l(D,C,M,A,z,10,a[57]),A=l(A,D,C,M,w,15,a[58]),M=l(M,A,D,C,H,21,a[59]),C=l(C,M,A,D,y,6,a[60]),D=l(D,C,M,A,b,10,a[61]),A=l(A,D,C,M,d,15,a[62]),M=l(M,A,D,C,m,21,a[63]),o[0]=o[0]+C|0,o[1]=o[1]+M|0,o[2]=o[2]+A|0,o[3]=o[3]+D|0},_doFinalize:function(){var t=this._data,r=t.words,e=8*this._nDataBytes,i=8*t.sigBytes;r[i>>>5]|=128<<24-i%32;var o=n.floor(e/4294967296),s=e;r[15+(i+64>>>9<<4)]=16711935&(o<<8|o>>>24)|4278255360&(o<<24|o>>>8),r[14+(i+64>>>9<<4)]=16711935&(s<<8|s>>>24)|4278255360&(s<<24|s>>>8),t.sigBytes=4*(r.length+1),this._process();for(var a=this._hash,c=a.words,u=0;u<4;u++){var f=c[u];c[u]=16711935&(f<<8|f>>>24)|4278255360&(f<<24|f>>>8)}return a},clone:function(){var t=o.clone.call(this);return t._hash=this._hash.clone(),t}});function u(t,n,r,e,i,o,s){var a=t+(n&r|~n&e)+i+s;return(a<<o|a>>>32-o)+n}function f(t,n,r,e,i,o,s){var a=t+(n&e|r&~e)+i+s;return(a<<o|a>>>32-o)+n}function h(t,n,r,e,i,o,s){var a=t+(n^r^e)+i+s;return(a<<o|a>>>32-o)+n}function l(t,n,r,e,i,o,s){var a=t+(r^(n|~e))+i+s;return(a<<o|a>>>32-o)+n}r.MD5=o._createHelper(c),r.HmacMD5=o._createHmacHelper(c)}(Math);
var CryptoJS = t;
/**
 * 
 * @param {string} data
 * @returns {string} 
 */
function md5(data) {
    return CryptoJS.enc.Hex.stringify(CryptoJS.MD5(data)); 
}

/**
 * 
 * @param {string} data
 * @param {string} key
 * @returns {string} 
 */
function HmacMd5(data, key) {
    return CryptoJS.enc.Hex.stringify(CryptoJS.HmacMD5(data, key)); 
}

// prelaunch.js
registerOnPrelaunch('app', function() {
    tt.request({
        xxx
    })
})

// 监听index页面，只有index页面冷启动才会执行
registerOnPrelaunch('pages/index/index', function () {
  console.log('request---');
  tt.request({
    url: "xxx",
    id: 'xxx',
    success: function success(res) {
      console.log('tt.request', 'success');
      tt.preloadImages({
        urls: res.xximgs
      });
    },
    fail: function fail(e) {
      console.log('request error', e);
    }
  });
 }
 
 // pages/index/index.js 逻辑代码
 tt.request({
    url: "xxx", // 如果prelaunch.js发起了url和id相同的请求，此时调用会直接复用之前发起的请求。
    id: 'xxx',
    usePrefetchCache: true, // 标识是否要消费预期的请求，默认为false
    success: function success(res) {
      console.log('tt.request', 'success');
    },
    fail: function fail(e) {
      console.log('request error', e);
    }
  });