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/* 得到日期年月日等加數字后的日期 */
Date.prototype.dateAdd = function(interval,number)
{
var d = this;
var k={"y":"FullYear", "q":"Month", "m":"Month", "w":"Date", "d":"Date", "h":"Hours", "n":"Minutes", "s":"Seconds", "ms":"MilliSeconds"};
var n={"q":3, "w":7};
eval("d.set"+k[interval]+"(d.get"+k[interval]+"()+"+((n[interval]||1)*number)+")");
return d;
};
/* 計算兩日期相差的日期年月日等 */
Date.prototype.dateDiff = function(interval,objDate)
{
var d=this, t=d.getTime(), t2=objDate.getTime(), i={};
i["y"]=objDate.getFullYear()-d.getFullYear();
i["q"]=i["y"]*4+Math.floor(objDate.getMonth()/4)-Math.floor(d.getMonth()/4);
i["m"]=i["y"]*12+objDate.getMonth()-d.getMonth();
i["ms"]=objDate.getTime()-d.getTime();
i["w"]=Math.floor((t2+345600000)/(604800000))-Math.floor((t+345600000)/(604800000));
i["d"]=Math.floor(t2/86400000)-Math.floor(t/86400000);
i["h"]=Math.floor(t2/3600000)-Math.floor(t/3600000);
i["n"]=Math.floor(t2/60000)-Math.floor(t/60000);
i["s"]=Math.floor(t2/1000)-Math.floor(t/1000);
return i[interval];
};

/*調用例子*/
window.onload = function(){
/*
interval:類型參數，可為："y":"FullYear", "q":"Month", "m":"Month", "w":"Date", "d":"Date", "h":"Hours", "n":"Minutes", "s":"Seconds", "ms":"MilliSeconds"
number:對應加上的數值
*/
var d1 = new Date();
alert(d1.toLocaleString());
d1.dateAdd("y" ,1);
alert(d1.toLocaleString());/*加1年*/

/*
interval:類型參數，可為："y":"FullYear", "q":"Month", "m":"Month", "w":"Date", "d":"Date", "h":"Hours", "n":"Minutes", "s":"Seconds", "ms":"MilliSeconds"
objDate:日期對象
*/
var d2 = new Date();
alert("相隔了"+ d2.dateDiff("y" ,d1) +"年");
};