javascript的日期问题 在线等

Question

<script  language=javascript>
var a=new Date("2005-02-01".replace(/-/ig,"/"));
alert(a);
a.setDate(a.getDate()+30);
alert(a);</script>

Answer 1

<SCRIPT LANGUAGE="JavaScript">
<!--
Date.prototype.dateAdd = function(interval,number)
{
var date = this;    switch(interval)
    {
        case "y" : 
            date.setFullYear(date.getFullYear()+number);
            return date;

        case "q" : 
            date.setMonth(date.getMonth()+number*3);
            return date;        case "m" : 
            date.setMonth(date.getMonth()+number);
            return date;        case "w" : 
            date.setDate(date.getDate()+number*7);
            return date;
        
        case "d" : 
            date.setDate(date.getDate()+number);
            return date;        case "h" : 
            date.setHours(date.getHours()+number);
            return date; case "m" : 
            date.setMinutes(date.getMinutes()+number);
            return date; case "s" : 
            date.setSeconds(date.getSeconds()+number);
            return date;        default : 
            date.setDate(d.getDate()+number);
            return date;
    }
}Date.prototype.instanceFromString = function(str)
{
return new Date(str.replace(/-/g, "\/"));
}var d = new Date();d.instanceFromString("2005-02-24");alert(d.dateAdd("d",5));
//-->
</SCRIPT>