JS 时间比较大小

    //var Stime = $( '#tb_starttime' ).val();
    //var Etime = $( '#tb_endtime' ).val();

    var Stime = "11/20/2013  16:26";
    var Etime = "11/20/2013  16:26";

    var beginTimes = Stime.val().substring(0, 10).split('-');
    var endTimes = Etime.val().substring(0, 10).split('-');

    beginTime = beginTimes[1] + '-' + beginTimes[2] + '-' + beginTimes[0] + ' ' + Stime.substring(10, 16);
    endTime = endTimes[1] + '-' + endTimes[2] + '-' + endTimes[0] + ' ' + Etime.substring(10, 16);
 
 beginTime = beginTime.replace( /-/ig , '/' );
 endTime = endTime.replace( /-/ig , '/' );
 var compTime = ( Date.parse(endTime) - Date.parse(beginTime)) / 3600 / 1000;

 if (compTime < 0) {
        alert("endTime小!");
    } else if (compTime > 0) {
        alert("endTime大!");
    } else if (compTime == 0) {
        alert("时间相等!");
    } else {
        return 'exception'
    }