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test.html
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test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>$Title$</title>
<script src="forword3days.js"></script>
</head>
<body>
<input type="text" id = "input1" placeholder="请输入日期（如：20190819）" style="width: 200px"/>
<button type="button" onclick = "getDate()">Click Me!</button>
<div id = 'test'></div>
<!-- <div id = 'date'></div> -->
</body>
<script type="text/javascript">
function getDate(){
var a = document.getElementById('input1').value;
var sysdate = string2Date(a);
var dateArray = beforeDay(3,sysdate);
// alert(dateArray)
document.getElementById('test').innerText = dateArray
// '前天：' + dateArray[0] + '昨天' + dateArray[1] + '今天' + dateArray[2];
}
function beforeDay(num,sysdate){
//设置日期，当前日期的前num天
var myDate = new Date(sysdate);
myDate.setDate(myDate.getDate() - (num-1));
var dateArray = [];
var dateTemp;
var flag = 1;
for (var i = 0; i < num; i++) {
dateTemp = myDate.getFullYear()+'-'+(myDate.getMonth()+1)+'-'+myDate.getDate();
dateArray.push(dateTemp);
myDate.setDate(myDate.getDate() + flag);
}
return dateArray;
}
function string2Date(str){
//将8位字符日期格式拼接为带中划线的字符日期格式
var dateString = str.substring(0,4) + '-' + str.substring(4,6) + '-' + str.substring(6,8);
//将字符串转换成Date类型
var temp = new Date(dateString);
//获取不带 0 的日期字符串
var returnDate = temp.getFullYear()+'-'+(temp.getMonth()+1)+"-"+temp.getDate();
return returnDate;
}
</script>
</html>