读取当前日期，再将day-7，判断day<=0针对不同月份的显示情况：
方法二：
先读取当前日期，再读取七天前日期。
显然，第二种方法简便了很多。
// 初始化时间设置
var DateRange = {
startTime：“2016-02”，
endTime：“2017-07”
}；
$(".workload [name = 'startMonth']").datepicker({
"startView":1,
minViewMode:1,
format:"yyyy-mm",
'endDate':DateRange.endTime,
'startDate':DateRange.startTime
}).on('changeDate',function(e){
var startTime = e.date
$(".workload [name = 'endMonth']").datepicker('setStartDate',startTime)
})；
$(".workload [name = 'endMonth']").datepicker({
"startView":1,
minViewMode:1,
format:"yyyy-mm",
'maxDate':DateRange.endTime,
'minDate':DateRange.startTime
}).on('changeDate',function(e){
var endTime = e.date
$(".workload [name = 'startMonth']").datepicker('setEndDate',endTime)
})；
MessageDigest digest = MessageDigest.getInstance("MD5")digest.update("dinghua".getBytes())
String pwd = new String(digest.digest())
<%@page pageEncoding="utf-8"%>
<html>
<head>
<title>JS日期选择器</title>
<script type="text/javascript">
function HS_DateAdd(interval,number,date){
number = parseInt(number)
if (typeof(date)=="string"){var date = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2])}
if (typeof(date)=="object"){var date = date}
switch(interval){
case "y":return new Date(date.getFullYear()+number,date.getMonth(),date.getDate())break
case "m":return new Date(date.getFullYear(),date.getMonth()+number,checkDate(date.getFullYear(),date.getMonth()+number,date.getDate()))break
case "d":return new Date(date.getFullYear(),date.getMonth(),date.getDate()+number)break
case "w":return new Date(date.getFullYear(),date.getMonth(),7*number+date.getDate())break
}
}
function checkDate(year,month,date){
var enddate = ["31","28","31","30","31","30","31","31","30","31","30","31"]
var returnDate = ""
if (year%4==0){enddate[1]="29"}
if (date>enddate[month]){returnDate = enddate[month]}else{returnDate = date}
return returnDate
}
function WeekDay(date){
var theDate
if (typeof(date)=="string"){theDate = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2])}
if (typeof(date)=="object"){theDate = date}
return theDate.getDay()
}
function HS_calender(){
var lis = ""
var style = ""
style +="<style type='text/css'>"
style +=".calender { width:170pxheight:autofont-size:12pxmargin-right:14pxbackground:url(calenderbg.gif) no-repeat right center #fffborder:1px solid #397EAEpadding:1px}"
style +=".calender ul {list-style-type:nonemargin:0padding:0}"
style +=".calender .day { background-color:#EDF5FFheight:20px}"
style +=".calender .day li,.calender .date li{ float:leftwidth:14%height:20pxline-height:20pxtext-align:center}"
style +=".calender li a { text-decoration:nonefont-family:Tahomafont-size:11pxcolor:#333}"
style +=".calender li a:hover { color:#f30text-decoration:underline}"
style +=".calender li a.hasArticle {font-weight:boldcolor:#f60 !important}"
style +=".lastMonthDate, .nextMonthDate {color:#bbbfont-size:11px}"
style +=".selectThisYear a, .selectThisMonth a{text-decoration:nonemargin:0 2pxcolor:#000font-weight:bold}"
style +=".calender .LastMonth, .calender .NextMonth{ text-decoration:nonecolor:#000font-size:18pxfont-weight:boldline-height:16px}"
style +=".calender .LastMonth { float:left}"
style +=".calender .NextMonth { float:right}"
style +=".calenderBody {clear:both}"
style +=".calenderTitle {text-align:centerheight:20pxline-height:20pxclear:both}"
style +=".today { background-color:#ffffaaborder:1px solid #f60padding:2px}"
style +=".today a { color:#f30}"
style +=".calenderBottom {clear:bothborder-top:1px solid #dddpadding: 3px 0text-align:left}"
style +=".calenderBottom a {text-decoration:nonemargin:2px !importantfont-weight:boldcolor:#000}"
style +=".calenderBottom a.closeCalender{float:right}"
style +=".closeCalenderBox {float:rightborder:1px solid #000background:#ffffont-size:9pxwidth:11pxheight:11pxline-height:11pxtext-align:centeroverflow:hiddenfont-weight:normal !important}"
style +="</style>"
var now
if (typeof(arguments[0])=="string"){
selectDate = arguments[0].split("-")
var year = selectDate[0]
var month = parseInt(selectDate[1])-1+""
var date = selectDate[2]
now = new Date(year,month,date)
}else if (typeof(arguments[0])=="object"){
now = arguments[0]
}
var lastMonthEndDate = HS_DateAdd("d","-1",now.getFullYear()+"-"+now.getMonth()+"-01").getDate()
var lastMonthDate = WeekDay(now.getFullYear()+"-"+now.getMonth()+"-01")
var thisMonthLastDate = HS_DateAdd("d","-1",now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-01")
var thisMonthEndDate = thisMonthLastDate.getDate()
var thisMonthEndDay = thisMonthLastDate.getDay()
var todayObj = new Date()
today = todayObj.getFullYear()+"-"+todayObj.getMonth()+"-"+todayObj.getDate()
for (i=0i<lastMonthDatei++){ // Last Month's Date
lis = "<li class='lastMonthDate'>"+lastMonthEndDate+"</li>" + lis
lastMonthEndDate--
}
for (i=1i<=thisMonthEndDatei++){ // Current Month's Date
if(today == now.getFullYear()+"-"+now.getMonth()+"-"+i){
var todayString = now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-"+i
lis += "<li><a href=javascript:void(0) class='today' onclick='_selectThisDay(this)' title='"+now.getFullYear()+"-"+(parseInt(now.getMonth())+1)+"-"+i+"'>"+i+"</a></li>"
}else{
lis += "<li><a href=javascript:void(0) onclick='_selectThisDay(this)' title='"+now.getFullYear()+"-"+(parseInt(now.getMonth())+1)+"-"+i+"'>"+i+"</a></li>"
}
}
var j=1
for (i=thisMonthEndDayi<6i++){ // Next Month's Date
lis += "<li class='nextMonthDate'>"+j+"</li>"
j++
}
lis += style
var CalenderTitle = "<a href='javascript:void(0)' class='NextMonth' onclick=HS_calender(HS_DateAdd('m',1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this) title='Next Month'>»</a>"
CalenderTitle += "<a href='javascript:void(0)' class='LastMonth' onclick=HS_calender(HS_DateAdd('m',-1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this) title='Previous Month'>«</a>"
CalenderTitle += "<span class='selectThisYear'><a href='javascript:void(0)' onclick='CalenderselectYear(this)' title='Click here to select other year' >"+now.getFullYear()+"</a></span>年<span class='selectThisMonth'><a href='javascript:void(0)' onclick='CalenderselectMonth(this)' title='Click here to select other month'>"+(parseInt(now.getMonth())+1).toString()+"</a></span>月"
if (arguments.length>1){
arguments[1].parentNode.parentNode.getElementsByTagName("ul")[1].innerHTML = lis
arguments[1].parentNode.innerHTML = CalenderTitle
}else{
var CalenderBox = style+"<div class='calender'><div class='calenderTitle'>"+CalenderTitle+"</div><div class='calenderBody'><ul class='day'><li>日</li><li>一</li><li>二</li><li>三</li><li>四</li><li>五</li><li>六</li></ul><ul class='date' id='thisMonthDate'>"+lis+"</ul></div><div class='calenderBottom'><a href='javascript:void(0)' class='closeCalender' onclick='closeCalender(this)'>×</a><span><span><a href=javascript:void(0) onclick='_selectThisDay(this)' title='"+todayString+"'>Today</a></span></span></div></div>"
return CalenderBox
}
}
function _selectThisDay(d){
var boxObj = d.parentNode.parentNode.parentNode.parentNode.parentNode
boxObj.targetObj.value = d.title
boxObj.parentNode.removeChild(boxObj)
}
function closeCalender(d){
var boxObj = d.parentNode.parentNode.parentNode
boxObj.parentNode.removeChild(boxObj)
}
function CalenderselectYear(obj){
var opt = ""
var thisYear = obj.innerHTML
for (i=1970i<=2020i++){
if (i==thisYear){
opt += "<option value="+i+" selected>"+i+"</option>"
}else{
opt += "<option value="+i+">"+i+"</option>"
}
}
opt = "<select onblur='selectThisYear(this)' onchange='selectThisYear(this)' style='font-size:11px'>"+opt+"</select>"
obj.parentNode.innerHTML = opt
}
function selectThisYear(obj){
HS_calender(obj.value+"-"+obj.parentNode.parentNode.getElementsByTagName("span")[1].getElementsByTagName("a")[0].innerHTML+"-1",obj.parentNode)
}
function CalenderselectMonth(obj){
var opt = ""
var thisMonth = obj.innerHTML
for (i=1i<=12i++){
if (i==thisMonth){
opt += "<option value="+i+" selected>"+i+"</option>"
}else{
opt += "<option value="+i+">"+i+"</option>"
}
}
opt = "<select onblur='selectThisMonth(this)' onchange='selectThisMonth(this)' style='font-size:11px'>"+opt+"</select>"
obj.parentNode.innerHTML = opt
}
function selectThisMonth(obj){
HS_calender(obj.parentNode.parentNode.getElementsByTagName("span")[0].getElementsByTagName("a")[0].innerHTML+"-"+obj.value+"-1",obj.parentNode)
}
function HS_setDate(inputObj){
var calenderObj = document.createElement("span")
calenderObj.innerHTML = HS_calender(new Date())
calenderObj.style.position = "absolute"
calenderObj.targetObj = inputObj
inputObj.parentNode.insertBefore(calenderObj,inputObj.nextSibling)
}
</script>
<style>
body {font-size:12px}
td {text-align:center}
h1 {font-size:26px}
h4 {font-size:16px}
em {color:#999margin:0 10pxfont-size:11pxdisplay:block}
</style>
</head>
<body>
<h1>Date Picker Demo By Codefans.net</h1>
<h4 style="border-bottom:1px solid #ccc">ver:1.0</h4>
<table border="1" width="400" height="150">
<tr>
<td>这是示例文字</td>
<td>示例输入框</td>
<td>文本文本文本</td>
</tr>
<tr>
<td>示例输入框</td>
<td><input type="text" style="width:70px" onfocus="HS_setDate(this)">文本</td>
<td>这里是你的文字</td>
</tr>
<tr>
<td>一段文字</td>
<td>示例输入框</td>
<td>文本<input type="text" style="width:70px" onfocus="HS_setDate(this)">文本</td>
</tr>
</table>
<ul>
<li>它不需要其他框架类支持</li>
<li>支持多种浏览器</li>
<li>点击年份、月份可下拉选择</li>
</ul>
</body>
</html>
