this

 

"use strict";

function Greet(name) {

    this.name = name;

    this.sayHello = function () {

        console.log("Hello " + this.name);

    };

}

var greet = new Greet("tom");

greet.sayHello();

输出：Hello tom

 

 

 

"use strict";

function Greet(name) {

    this.name = name;

    function sayHello() {

        console.log("Hello " + this.name);

    }

    return {

        name: "cat",

        sayHi: sayHello

    };

}

var greet = new Greet("tom");

greet.sayHi();

 

输出：Hello cat

 

 

"use strict";

function Greet(name) {

    var that = this;

    this.name = name;

    function sayHello() {

        console.log("Hello " + that.name);

    }

    return {

        name: "cat",

        sayHi: sayHello

    };

}

var greet = new Greet("tom");

greet.sayHi();

 

输出：Hello tom