研究javascript的几个例子（一）

关键字：构造继承,prototype
JS.js文件：

function BaseClass(){

this.name="BaseClass";

//this.prototype.Height="1.5米"; 错误写法

BaseClass.prototype.Height="1.5米";

this.Width="2米";

this.Weight="1吨";

this.say=function(){

return "my name is "+this.name+",Height:"+this.Height+",Width:"+this.Width+",Weight:"+this.Weight;

}

function SonClass(){

this.base=BaseClass;

this.base();

this.Weight="2吨";

this.Color="red";

this.Title="SonClass";

this.loudsay=function(){

return "my name is "+this.Title+",Height:"+this.Height+",Width:"+this.Width+",Weight:"+this.Weight+",Color:"+this.Color;

}

SonClass.prototype.Speed="100";

SonClass.prototype.run=function(){

return "my name is "+this.Title+",Height:"+this.Height+",Width:"+this.Width+",Weight:"+this.Weight+",Color:"+this.Color+",Speed:"+this.Speed;

}

HTML：

<html>

<head>

//BaseClass baseclass = new BaseClass();错误写法

var baseclass = new BaseClass();

alert(baseclass.name); //Base

alert(baseclass.say());//my name is BaseClass,Height:1.5米,Width:2米,Weight:1吨

var Son = new SonClass();

alert(Son.say());//my name is BaseClass,Height:undefined,Width:2米,Weight:2吨

alert(Son.loudsay());//my name is SonClass,Height:undefined,Width:2米,Weight:2吨,Color:red

alert(Son.run());//my name is SonClass,Height:undefined,Width:2米,Weight:2吨,Color:red,Speed:100

SonClass.prototype.Height="2.5米";

alert(Son.run());//my name is SonClass,Height:2.5米,Width:2米,Weight:2吨,Color:red,Speed:100

</script>

</head>

<body >

</body>

</html>