当代码 new foo(...) 执行时：

1. 一个新对象被创建。它继承自foo.prototype.
2. 构造函数 foo 被执行。执行的时候，相应的传参会被传入，同时上下文(this)会被指定为这个新实例。new foo 等同于 new foo(), 只能用在不传递任何参数的情况。
3. 如果构造函数返回了一个“对象”，那么这个对象会取代整个new出来的结果。如果构造函数没有返回对象，那么new出来的结果为步骤1创建的对象。(一般情况下构造函数不返回任何值，不过用户如果想覆盖这个返回值，可以自己选择返回一个普通对象来覆盖。当然，返回数组也会覆盖，因为数组也是对象。)

It does 5 things:

1. It creates a new object. The type of this object, is simply object.
2. It sets this new object's internal, inaccessible, [[prototype]] (i.e. proto) property to be the constructor function's external, accessible, prototype object (every function object automatically has a prototype property).
3. It makes the this variable point to the newly created object.
4. It executes the constructor function, using the newly created object whenever this is mentioned.
5. It returns the newly created object, unless the constructor function returns a non-null object reference. In this case, that object reference is returned instead.

Note: constructor function refers the function after the new keyword, as in

new ConstructorFunction(arg1, arg2)

Once this is done, if an undefined property of the new object is requested, the script will check the object's [[prototype]] object for the property instead. This is how you can get something similar to traditional class inheritance in JavaScript.

The most difficult part about this is point number 2. Every object (including functions) has this internal property called [[prototype]]. It can only be set at object creation time, either with new, with Object.create, or based on the literal (functions default to Function.prototype, numbers to Number.prototype, etc.). It can only be read with Object.getPrototypeOf(someObject). There is no other way to set or read this value.

Functions, in addition to the hidden [[prototype]] property, also have a property called prototype, and it is this that you can access, and modify, to provide inherited properties and methods for the objects you make.

Here is an example:

ObjMaker = function() {this.a = 'first';};// ObjMaker is just a function, there's nothing special about it that makes // it a constructor.ObjMaker.prototype.b = 'second';// like all functions, ObjMaker has an accessible prototype property that // we can alter. I just added a property called 'b' to it. Like // all objects, ObjMaker also has an inaccessible [[prototype]] property// that we can't do anything withobj1 = new ObjMaker();// 3 things just happened.// A new, empty object was created called obj1.  At first obj1 was the same// as {}. The [[prototype]] property of obj1 was then set to the current// object value of the ObjMaker.prototype (if ObjMaker.prototype is later// assigned a new object value, obj1's [[prototype]] will not change, but you// can alter the properties of ObjMaker.prototype to add to both the// prototype and [[prototype]]). The ObjMaker function was executed, with// obj1 in place of this... so obj1.a was set to 'first'.obj1.a;// returns 'first'obj1.b;// obj1 doesn't have a property called 'b', so JavaScript checks // its [[prototype]]. Its [[prototype]] is the same as ObjMaker.prototype// ObjMaker.prototype has a property called 'b' with value 'second'// returns 'second'It's like class inheritance because now, any objects you make using new ObjMaker() will also appear to have inherited the 'b' property.If you want something like a subclass, then you do this:SubObjMaker = function () {};SubObjMaker.prototype = new ObjMaker(); // note: this pattern is deprecated!// Because we used 'new', the [[prototype]] property of SubObjMaker.prototype// is now set to the object value of ObjMaker.prototype.// The modern way to do this is with Object.create(), which was added in ECMAScript 5:// SubObjMaker.prototype = Object.create(ObjMaker.prototype);SubObjMaker.prototype.c = 'third';  obj2 = new SubObjMaker();// [[prototype]] property of obj2 is now set to SubObjMaker.prototype// Remember that the [[prototype]] property of SubObjMaker.prototype// is ObjMaker.prototype. So now obj2 has a prototype chain!// obj2 ---> SubObjMaker.prototype ---> ObjMaker.prototypeobj2.c;// returns 'third', from SubObjMaker.prototypeobj2.b;// returns 'second', from ObjMaker.prototypeobj2.a;// returns 'first', from SubObjMaker.prototype, because SubObjMaker.prototype // was created with the ObjMaker function, which assigned a for us

I read a ton of rubbish on this subject before finally finding this page, where this is explained very well with nice diagrams.