本文通过JavaScript代码演示了如何计算两个日期之间的天数差。利用Date对象和getTime方法获取时间戳进行计算，并展示了替换字符串中的特定字符的方法。
<SCRIPT LANGUAGE="JavaScript">
//execScript('n = DateDiff("d","2003-01-01","2003-01-02")');
//document.write(n);
var s="2003-01-01";
var s2="2003-01-03";
var date=new Date(Date.parse(s.replace(/-/g, "/")));
var date2=new Date(Date.parse(s2.replace(/-/g, "/")));
var str=date2.getTime()-date.getTime();
var sr=str/(24*3600*1000);
//alert(39*365*24*3600*1000);
alert(sr);
</SCRIPT>
//execScript('n = DateDiff("d","2003-01-01","2003-01-02")');
//document.write(n);
var s="2003-01-01";
var s2="2003-01-03";
var date=new Date(Date.parse(s.replace(/-/g, "/")));
var date2=new Date(Date.parse(s2.replace(/-/g, "/")));
var str=date2.getTime()-date.getTime();
var sr=str/(24*3600*1000);
//alert(39*365*24*3600*1000);
alert(sr);
</SCRIPT>
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