在前端页面的日期选择框里放入当前日期以及一个月前的日期。先直接将month减去1，如果减完日期无效，例如：3月31变为2月31,，出现逻辑错误，那就采取减30天的方案
jsp代码
<div class="searchTips" style="width: 520px;">
<span class="tipsSpan">报废日期：</span>
<input id="startDate1" type="text" class="input-text radius size-S Wdate tipsIpt" placeholder=""
onfocus="WdatePicker({dateFmt:'yyyy-MM-dd',readOnly:true,qsEnabled:false,maxDate:'#F{$dp.$D(\'startDate2\')}'})">
<span style="float: left; margin: 0 5px;">-</span>
<input id="startDate2" type="text"
class="input-text radius size-S Wdate tipsIpt" placeholder=""
onfocus="WdatePicker({dateFmt:'yyyy-MM-dd',readOnly:true,qsEnabled:false,minDate:'#F{$dp.$D(\'startDate1\')}'})">
</div>
js代码
初始化date框
function init_date() {
//现在
var time = new Date();
var day = ('0' + time.getDate()).slice(-2);
var month = ('0' + (time.getMonth() + 1)).slice(-2);
var today = time.getFullYear() + '-' + month + '-' + day ;
$('#startDate2').val(today);
//1.一个月前 month直接减1
var monthAgo = ('0' + (time.getMonth() )).slice(-2);
var oneMonAgo = time.getFullYear() + '-' + monthAgo + '-' + day ;
if(month=="01"){
monthAgo = 12;
var yearAgo = time.getFullYear()-1;
oneMonAgo =yearAgo + '-' + monthAgo + '-' + day ;
}
//如果日期有效
if(judgeDate(oneMonAgo)){
$('#startDate1').val(oneMonAgo);
}else{
//2.减去30天
var ago=new Date(time.getTime() - 30*24*60*60*1000); //30天前
var day = ('0' + ago.getDate()).slice(-2);
var month = ('0' + (ago.getMonth() + 1)).slice(-2);
var oneMonAgo = ago.getFullYear() + '-' + month + '-' + day ;
$('#startDate1').val(oneMonAgo);
}
}
日期有效验证
有平年闰年之分
function judgeDate(date){
const rmons = [31,29,31,30,31,30,31,31,30,31,30,31],
pmons = [31,28,31,30,31,30,31,31,30,31,30,31];
var year = parseInt(date.substr(0,4)),
mon = parseInt(date.substr(5,7)),
day = parseInt(date.substr(8,10));
if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0){
return mon > 0 && mon <=12 && day > 0 && day <= rmons[mon-1];
}else{
return mon > 0 && mon <=12 && day > 0 && day <= pmons[mon-1];
}
}
结果
验证
在上文的代码加日期参数
var time = new Date("2013-03-29");
前端刷新后
