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<html><head> <script type="text/javascript"> Date.prototype.format = function(fmt) { var o = { "M+" : this.getMonth()+1, //月份 "d+" : this.getDate(), //日 "h+" : this.getHours(), //小時 "m+" : this.getMinutes(), //分 "s+" : this.getSeconds(), //秒 "q+" : Math.floor((this.getMonth()+3)/3), //季度 "S" : this.getMilliseconds() //毫秒 }; if(/(y+)/.test(fmt)) fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); for(var k in o) if(new RegExp("("+ k +")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1)?(o[k]):(("00"+ o[k]).substr((""+ o[k]).length))); return fmt;}function getDate(day){ var zdate=new Date(); var sdate=zdate.getTime()-(1*24*60*60*1000); var edate=new Date(sdate-(day*24*60*60*1000)).format("yyyy-MM-dd"); return edate;}function wirte(){var a = getDate(-7);document.write(a);} </script></head><body onload="wirte()"><!-- document.write()//前七天getDate(0)//昨天getDate(-1)//今天getDate(-7) --></body></html>
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