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Javascript 自定义类型

2010-03-02 11:40 369 查看

1.定义类型

functionuserobject(parameter){
}
parameter可省略，相当于C#中构造函数参数。

2.实例化自定义类型

<scripttype="text/javascript">
functionuserobject(parameter){
}
//myobjectisnowanobjectoftypeuserobject!
varmyobject=newuserobject("hi")

alert(myobject)
</script>

3.添加属性

functionuserobject(parameter){

this.firstproperty=parameter

this.secondproperty="Thisisthesecondproperty"

//使用

<script>

varmyobject=newuserobject("hithere.")

//alerts"hithere."

alert(myobject.firstproperty)

//writes"Thisisthesecondproperty"

document.write(myobject.secondproperty)

</script>

4.添加方法（circle类）

//firstmethodfunction
functioncomputearea(){
vararea=this.radius*this.radius*3.14
returnarea
}

//secondmethodfunction
functioncomputediameter(){
vardiameter=this.radius*2
returndiameter
}

<scripttype="text/javascript">
/*thebelowcreatesanewobject,andgivesitthetwomethodsdefinedearlier*/
functioncircle(r){
//propertythatstorestheradius
this.radius=r
this.area=computearea
this.diameter=computediameter
}
</script>

使用自定义方法：

<scripttype="text/javascript">
varmycircle=newcircle(20)
//alerts1256
alert("area="+mycircle.area())
//alerts400
alert("diameter="+mycircle.diameter())
</script>

.csharpcode,.csharpcodepre
{
font-size:small;
color:black;
font-family:consolas,"CourierNew",courier,monospace;
background-color:#ffffff;
/*white-space:pre;*/
}
.csharpcodepre{margin:0em;}
.csharpcode.rem{color:#008000;}
.csharpcode.kwrd{color:#0000ff;}
.csharpcode.str{color:#006080;}
.csharpcode.op{color:#0000c0;}
.csharpcode.preproc{color:#cc6633;}
.csharpcode.asp{background-color:#ffff00;}
.csharpcode.html{color:#800000;}
.csharpcode.attr{color:#ff0000;}
.csharpcode.alt
{
background-color:#f4f4f4;
width:100%;
margin:0em;
}
.csharpcode.lnum{color:#606060;}

.csharpcode,.csharpcodepre
{
font-size:small;
color:black;
font-family:consolas,"CourierNew",courier,monospace;
background-color:#ffffff;
/*white-space:pre;*/
}
.csharpcodepre{margin:0em;}
.csharpcode.rem{color:#008000;}
.csharpcode.kwrd{color:#0000ff;}
.csharpcode.str{color:#006080;}
.csharpcode.op{color:#0000c0;}
.csharpcode.preproc{color:#cc6633;}
.csharpcode.asp{background-color:#ffff00;}
.csharpcode.html{color:#800000;}
.csharpcode.attr{color:#ff0000;}
.csharpcode.alt
{
background-color:#f4f4f4;
width:100%;
margin:0em;
}
.csharpcode.lnum{color:#606060;}

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