JavaScript为对象原型prototype添加属性的两种方式_js面向对象

复制代码 代码如下:

<script type="text/javascript">
<!--
/*
给原型 prototype 添加属性的两种方式
*/
//方式一
var myObj = function(){
this.study = "JavaScript";
}
myObj.prototype.hobby = function()
{
this.hobby = "See girl";
}
var newObj = new myObj();
for ( var attr in newObj )
{
document.write( attr +"<br/>" );
}
document.write( "==================== <br/>" );
//方式二
var superObj = { name:"xugang" };
var subObj = { age:20 };
function extend(superObj,subObj){
//获得父对象的原型对象
subObj.getSuper = superObj.prototype;
//将父对象的属性给子对象
for(var i in superObj){
subObj[i] = superObj[i];
}
}
extend(superObj,subObj);
for ( var s in subObj )
{
document.write( s +"<br/>" ); //遍历子对象的属性
}
//-->
</script>

运行结果：

hobby
study
====================
age
getSuper
name