class2.call(class1) 

 <body>
<script type="text/javascript">

var obj = {  
    name : 'object-name',
    sayName : function () {
        alert(this.name);
    }
};

obj.sayName(); // object-name



var test = function () {  
    this.message = 12;
}
test();  
alert(window.message); //12 
alert(self.message);//12 
alert(this.message);//12 

</script>
 </body>
 <body>
<script type="text/javascript">
var message  = "hi~~~";
var test = function () {  
    alert(this.message);
    alert(self.message);
}

test(); 
// hi~~~ 
// hi~~~ 
</script>
 </body>
 <body>
<script type="text/javascript">
var name  = "global";  
function Person () {  
    this.name = "someone";
}

var sam = new Person();  
alert(sam.name); // someone
alert(window.name); //global
Person();
alert(window.name); // someone
</script>
 </body>
 <body>
<script type="text/javascript">
var sayName = function () {  
    alert(this.name);
}

var peter = {  
    name: "peter"
}

sayName.call(peter); //peter 

</script>
 </body>
 <body>
<script type="text/javascript">
function Person1 () {  
    this.name = "person1";
    this.sayName = function () {
        alert(this.name);
    }
}

function Person2 () {  
    this.name = "person2";
}

var sam = new Person2();
alert(sam.name);//person2

Person1.call(sam);

sam.sayName(); //person1 

alert(sam.name);//person1 
</script>
 </body>
 <body>
<script type="text/javascript">

function class1 () {  
    this.message = "yeah";
}

function class2 () {  
    this.sayMessage = function () {
        alert(this.message);
    }
}

class2.call(class1);  
alert(class1.sayMessage); /*function () {  alert(this.message); } */
class1.sayMessage(); //undefined 

var obj1=new class1();
//obj1.sayMessage();//
class1.sayMessage.call(obj1);//yeah
</script>
 </body>
 <body>
<script type="text/javascript">
var message = "hi";

function class1 () {  
    this.message = "yeah";
}

function class2 () {  
    this.message = "hello";
    this.sayMessage = function () {
        alert(this.message);
    }
}

class2.call(class1);  
alert(class1.sayMessage);//  function
class1.sayMessage(); // hello

class1.message = "msg";

class1.sayMessage(); //msg  

</script>
 </body>
 <body>
<script type="text/javascript">

function Class1(){  
    this.showTxt = function(){alert(this.name)}
}

function Class2(){  
    this.name = 'class2';
}

var class1 = new Class1();

class1.showTxt.call(Class2);//Class2  (类Class2有它自己的name属性)
class1.showTxt.call(new Class2());//class2

alert(Class2.showTxt);//undefined  
Class1.call(Class2);
alert(Class2.showTxt);//function(){alert(this.name)}

</script>
 </body>

 

posted @ 2018-02-14 15:43  sky20080101  阅读(80)  评论(0)    收藏  举报