javascript中的时间大小比较

<script type="text/javascript">function timedate() {//开始时间var begin = "2012-12-13 11:25:02";//结束时间var end = "2012-12-13 11:25:03";//begin = begin.replace("-", "/"); //end = end.replace("-", "/"); begin = begin.replace(/-/g, "/");end = end.replace(/-/g, "/");var dt = new Date(Date.parse(begin));var dt1 = new Date(Date.parse(end));alert(dt1 > dt);}</script>