JavaScript為對象原型prototype添加屬性的兩種方式

複製代碼 代碼如下:<script type="text/javascript">
<!--
/*
給原型 prototype 添加屬性的兩種方式
*/
//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){
//獲得父物件的原型對象
subObj.getSuper = superObj.prototype;
//將父物件的屬性給子物件
for(var i in superObj){
subObj[i] = superObj[i];
}
}
extend(superObj,subObj);
for ( var s in subObj )
{
document.write( s +"<br/>" ); //遍曆子物件的屬性
}
//-->
</script>

運行結果：

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