微信小程序require机制详解及实例代码

(projectManager.js)
function getScripts(projInfo, callback) {
 ...
  fs.readFile(fname, 'utf8', function(err, scripts) {
    ....  
    scripts = 'define("' + moduleName + '", function(require, module, exports, ' + noBrowserStr +
    '){ ' + scripts + '\n});',
    needRequire && (scripts += 'require("' + moduleName + '")'), //page页面js文件，会添加上require自己，加载后立即初始化。
    .....
    callback(null, scripts) //scripts串内容作为HTTP GET的返回

......
  var 
  ......
  moduleList = {}; 
  define = function(moduleName, factory) { //define是全局函数,每个JS文件都默认会调用. 
    moduleList[moduleName] = { status: status1, factory: factory }
  };

....
  require = function(moduleName) {    
    ....
    var module = moduleList[moduleName]; //define函数调用时为moduleList赋的值
    .....
    if (module.status === status1) { 
      //如果未初始化,则初始化
      var factory = module.factory, //这个factory就是这个JS文件的脚本.
      obj = { exports: {} }, u = void 0;
      factory && (u = factory(o(moduleName), obj, obj.exports)), module.exports = obj.exports || u, module.status = status2
    }
    return module.exports
  }

代理服务部分代码:
(projectManager.js)
function getScripts(projInfo, callback) {
 ...
  fs.readFile(fname, 'utf8', function(err, scripts) {
    ....  
    //page页面js文件，needRequire值为TRUE，会添加上require自己
    needRequire && (scripts += 'require("' + moduleName + '")'), 
    .....