jsを使用して簡単なモジュールローダーを実装する方法

require(['a', 'b'], function(a, b) {
    console.log(a, b);
});

    this.cid = ++contextId;
    this.init(deps, callback, errback);
}
;
    Context.prototype.init = function(deps, callback, errback) {
    this.deps = deps;
    this.callback = callback;
    this.errback = errback;
    contexts[this.cid] = this;
}
;

    let depCount = this.deps ? this.deps.length : 0;
    // require.js中处理循环依赖的处理 let requireInDep = (this.deps || []).indexOf('require');
    if (requireInDep !== -1) {
    depCount--;
    this.requireInDep = requireInDep;
    this.deps.splice(requireInDep, 1);
}
// 处理循环依赖情况 let cycleArray = this.checkCycle();
    if (cycleArray) {
    depCount = depCount - cycleArray.length;
}
// depCount表示当前模块的依赖模块数，depCount为0表示模块中某一依赖加载完成 this.depCount = depCount;
    if (depCount === 0) {
    this.execute();
    return;
}
// 遍历依赖列表，创建Module对象，并且将当前模块与其依赖的关系构建出来maps this.deps.forEach((depModuleName) => {
    if (!modules[depModuleName]) {
    let module = new Module(depModuleName);
    modules[module.name] = module;
}
if (!maps[depModuleName]) {
    maps[depModuleName] = [];
}
maps[depModuleName].push(this);
}
);

   if (requireInDep !== -1) {
    depCount--;
    this.requireInDep = requireInDep;
    this.deps.splice(requireInDep, 1);
}
// 获取循环依赖 let cycleArray = this.checkCycle();
    if (cycleArray) {
    depCount = depCount - cycleArray.length;
}
// execute函数中代码// 插入require到回调函数的参数列表中if (this.requireInDep !== -1 && this.requireInDep !== undefined) {
    arg.splice(this.requireInDep, 0, require);
}