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ת×Ô£ºhttp://www.cnblogs.com/greki/archive/2009/06/02/1494863.html
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1. »ìºÏ¹¹Ô캯Êý/Ô­ÐÍ·½Ê½
function  Car(sColor, iDoors, iMpg) {
this .color  =  sColor;
this .doors  =  iDoors;
this .mpg  =  iMpg;
this .drivers  = new  Array(“Mike”, “Sue”);
}
Car.prototype.showColor  = function  () {
  alert( this .color);
};
var  oCar1  = new  Car(“red”,  4 ,  23 );
var  oCar2  = new  Car(“blue”,  3 ,  25 );
oCar1.drivers.push(“Matt”);
alert(oCar1.drivers);  // outputs “Mike,Sue,Matt”
alert(oCar2.drivers);  // outputs “Mike,Sue”
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2 . ¶¯Ì¬Ô­ÐÍ·½Ê½

function  Car(sColor, iDoors, iMpg) 
{
this .color  =  sColor;
this .doors  =  iDoors;
this .mpg  =  iMpg;
this .drivers  = new  Array(“Mike”, “Sue”);
if  ( typeof  Car._initialized  ==  “undefined”) 
{
    Car.prototype.showColor  = function  () 
{
      alert( this .color);
    } ;
    Car._initialized  = true ;
  }
}
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function showBirthday(val){
var birthdayValue;
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if(parseInt(birthdayValue)<10){
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