创建一个匿名原型，并使用参数将Something原型应用于它，然后创建该匿名原型的新实例。这样做的一个缺点是它不会通过s instanceof Something检查，尽管它是相同的，但它基本上是一个克隆的实例。

function Something(){
    // init stuff
}
function createSomething(){
    return new (function(){Something.apply(this, arguments)});
}
var s = createSomething(a,b,c); // 's' is an instance of Something

如果您对基于求值的解决方案感兴趣

function createSomething() {
    var q = [];
    for(var i = 0; i < arguments.length; i++)
        q.push("arguments[" + i + "]");
    return eval("new Something(" + q.join(",") + ")");
}

这可能是一种低效的处理这个问题的方法，但我认为它对我来说足够简单易懂。

function createSomething(){
    // use 'new' operator to instantiate a 'Something' object
    var tmp = new Something(); 

    // If the interpreter supports [JavaScript 1.8.5][2], use 'Object.create'
    // var tmp = Object.create(Something.prototype); 

    // calling the constructor again to initialize the object
    Something.apply(tmp, arguments); 
    return tmp;
}

任何函数(甚至是构造函数)都可以接受数量可变的参数。每个函数都有一个“arguments”变量，可以使用[].slice.call(arguments)转换为数组。

function Something(){
  this.options  = [].slice.call(arguments);

  this.toString = function (){
    return this.options.toString();
  };
}

var s = new Something(1, 2, 3, 4);
console.log( 's.options === "1,2,3,4":', (s.options == '1,2,3,4') );

var z = new Something(9, 10, 11);
console.log( 'z.options === "9,10,11":', (z.options == '9,10,11') );

上述测试产生以下输出:

s.options === "1,2,3,4": true
z.options === "9,10,11": true

是的，我们可以，javascript在本质上更多的是原型继承。

function Actor(name, age){
  this.name = name;
  this.age = age;
}

Actor.prototype.name = "unknown";
Actor.prototype.age = "unknown";

Actor.prototype.getName = function() {
    return this.name;
};

Actor.prototype.getAge = function() {
    return this.age;
};

当我们创建一个带有"new"的对象时，我们创建的对象继承getAge()，但如果我们使用apply(…)或call(…)来调用Actor，那么我们为"this"传递了一个对象，但我们传递的对象不会继承自Actor.prototype

除非，我们直接通过apply或调用Actor。原型但是....“this”指向“Actor”。this.name将写入:actor。prototype.name。从而影响所有用Actor创建的其他对象…因为我们覆盖的是原型而不是实例

var rajini = new Actor('Rajinikanth', 31);
console.log(rajini);
console.log(rajini.getName());
console.log(rajini.getAge());

var kamal = new Actor('kamal', 18);
console.log(kamal);
console.log(kamal.getName());
console.log(kamal.getAge());

让我们试试apply

var vijay = Actor.apply(null, ["pandaram", 33]);
if (vijay === undefined) {
    console.log("Actor(....) didn't return anything 
           since we didn't call it with new");
}

var ajith = {};
Actor.apply(ajith, ['ajith', 25]);
console.log(ajith); //Object {name: "ajith", age: 25}
try {
    ajith.getName();
} catch (E) {
    console.log("Error since we didn't inherit ajith.prototype");
}
console.log(Actor.prototype.age); //Unknown
console.log(Actor.prototype.name); //Unknown

通过传递Actor。prototype to Actor.call()作为第一个参数，当Actor()函数运行时，它执行this.name=name，因为“this”将指向Actor。原型,this.name =名称;意味着Actor.prototype.name =名称;

var simbhu = Actor.apply(Actor.prototype, ['simbhu', 28]);
if (simbhu === undefined) {
    console.log("Still undefined since the function didn't return anything.");
}
console.log(Actor.prototype.age); //simbhu
console.log(Actor.prototype.name); //28

var copy = Actor.prototype;
var dhanush = Actor.apply(copy, ["dhanush", 11]);
console.log(dhanush);
console.log("But now we've corrupted Parent.prototype in order to inherit");
console.log(Actor.prototype.age); //11
console.log(Actor.prototype.name); //dhanush

回到最初的问题，如何使用新的操作符与应用，这里是我的....

Function.prototype.new = function(){
    var constructor = this;
    function fn() {return constructor.apply(this, args)}
    var args = Array.prototype.slice.call(arguments);
    fn.prototype = this.prototype;
    return new fn
};

var thalaivar = Actor.new.apply(Parent, ["Thalaivar", 30]);
console.log(thalaivar);

其实最简单的方法是:

function Something (a, b) {
  this.a = a;
  this.b = b;
}
function createSomething(){
    return Something;
}
s = new (createSomething())(1, 2); 
// s == Something {a: 1, b: 2}