开发的理念是“为复用而开发，为使用而组装”，代码的复用度将是项目和产品的一个重要的技术指标。

var DateTools={

isDate:function(str)

{

var result = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);

if (result == null) return false;

var d = new Date(result[1], result[3] - 1, result[4]);

return (d.getFullYear() == result[1] && d.getMonth() + 1 == result[3] && d.getDate() == result[4]);

}

isDatetime:function(str)

{

var result = str.match(/^(\d{4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/);

if (result == null) return false;

var d = new Date(result[1], result[3] - 1, result[4], result[5], result[6], result[7]);

return (d.getFullYear() == result[1] && (d.getMonth() + 1) == result[3] && d.getDate() == result[4] && d.getHours() == result[5] && d.getMinutes() == result[6] && d.getSeconds() == result[7]);

}

isTime: function(str)

{

var a = str.match(/^(\d{1,2})(:)?(\d{1,2})\2(\d{1,2})$/);

if (a == null) { return false; }

if (a[1] >= 24 || a[3] >= 60 || a[4] >= 60) {

return false

}

return true;

}

compareDate: function(d1, d2) { //比较两个日期大小

return ((new Date(d1.replace(/-/g, "\/"))) < (new Date(d2.replace(/-/g, "\/"))));

}

}