jquery--this

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<script type=text/javascript charset=utf-8>

var x = "x";

var y = "yyy";

function F(a){

    this.n = 'fsfsf';

    this.sc = 4;

    var i = new init(this);//F()，this指的是window

    i.ii = "ii";

}

function init(o){

    alert(o);//[object Window]

    alert(sc);//4

    alert(o.x);//x

    alert(o.y);//yyy

    this.n = o.sc;  //init方法不是对象调用的时候，new的时候this指的是本类的对象，不是window对象

    this.name = "namename";

    this.o = o;

    that = this;

    return function(){

        alert("333" + this.n);//undefined,this是这个匿名函数的对象

        alert("333" + that.n);

        this.h = that;

        this.k = that.n;

        this.a = that.a

    }

    ;

}

alert(1);

var d = F(3);

alert(window.n)//fsfsf

alert(2);

var dd = new d();

alert(window.name)//空

alert(3);

alert(dd.k);//4

alert(dd.h.name);//namename

alert(dd.a.n);//fsfsf

alert(window.k);//undefined

alert(window.h.name);//Cannot read property 'name' of undefined

alert(window.a.n);//Cannot read property 'n' of undefined   

function F(a){

    this.n = 1;

    this.sc = 4;

    return new init(this);//this是F对象

}

function init(a){

    alert("111" + a.sc);//4

    this.n = a.sc;

    return {

        k : this.n

    }

}

alert(1);

var d = F(3);

alert(d.k); //4

function F(a){

    this.n = 1;

    this.sc = "scscsc";

}

var d = new F();

alert(window.sc);//undefined

</script>

</head>

<body>

</body>

</html>
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jquery--this

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