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Date.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>月月计算器</title>
</head>
<style type="text/css">
input{
display: inline-block;
min-height: 20px;
padding:5px;
font-size: 20px;
margin: 20px;
width: 180px;
}
#frind{
width:500px;
margin:10px auto;
text-align: center;
border: 1px solid #9791e8;
}
#submit{
width: 300px;
}
label{
width: 150px;
display: inline-block;
text-align: right;
}
</style>
<body>
<div id="frind">
<h3>月月计算器</h3>
<label>上次的日期:</label><input type="date" id="lasttime" name="date1" value="">
<br>
<label>周期天数</label><input type="number" id="week1" name="week1" min="23" max="34" value="28">
<br>
<label>下次到来还有的天数</label><input readonly type="number" id="cont_time" name="conttime" value="">
<br>
<label>下次的预计日期:</label><input type="text" id="nexttime" name="date2" value="0">
<br>
<input type="submit" id="submit" name="submit" value="提交" onclick="runcalc()">
</div>
<script>
//声明获取id对象的方法函数
function $Id(id){
return document.getElementById(id)
}
//运算函数
function runcalc(){
lasttime = $Id('lasttime').value;
lasttime = Date.parse(lasttime); //把时间格式2018-08-06改成时间戳1533513600000。
week1 = $Id('week1').value;
week1 = week1 * 24 * 3600 * 1000;
nowtime = Date.now();
nexttime = lasttime + week1;
cont_time = (nexttime - nowtime)/(1000*3600*24);//把时间戳的差值转换成天数
if (lasttime > nowtime){
alert('请选择比当前时间更早的日期，你选择的上次日期不正确。');
return;
}else if(cont_time < 0){
alert('请确定您输入的是上次的日期，如果确定是，建议你去医院看医生。你可能中标了，哈哈哈！否则就是你在瞎闹！');
}else{
$Id('cont_time').value = Math.round(cont_time) ;
d = new Date(nexttime);
nexttime = d.toLocaleString();
$Id('nexttime').value = nexttime;
console.log(cont_time);
}
}
</script>
</body>
</html>