js实现日期的相加减

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<html>

 <head>

  <title> New Document </title>

  <meta name="Generator" content="EditPlus">

  <meta name="Author" content="">

  <meta name="Keywords" content="">

  <meta name="Description" content="">

  <script type="text/javascript">

function dateOperator(date,days,operator)

{

    date = date.replace(/-/g,"/"); //更改日期格式

	var nd = new Date(date);

	nd = nd.valueOf();

	if(operator=="+"){

	 nd = nd + days * 24 * 60 * 60 * 1000;

	}else if(operator=="-"){

		nd = nd - days * 24 * 60 * 60 * 1000;

	}else{

		return false;

	}

	nd = new Date(nd);

	var y = nd.getFullYear();

	var m = nd.getMonth()+1;

	var d = nd.getDate();

	if(m <= 9) m = "0"+m;

	if(d <= 9) d = "0"+d;

	var cdate = y+"-"+m+"-"+d;

	return cdate;

}

//相减

alert(dateOperator("2014-01-01",1,"-")) ;

//相加

alert(dateOperator("2014-01-01",1,"+")) ;

</script> 

  </script>

 </head>

 <body>

 </body>

</html>
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js实现日期的相加减

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