大家好，又见面了，我是你们的朋友全栈君。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.main {
width: 800px;
margin: 0 auto;
}
.top {
width: 800px;
margin: 0 auto;
}
#nian {
width: 100px;
height: 30px;
display: block;
}
#yue {
width: 100px;
height: 30px;
display: block;
}
.float {
display: block;
width: 50px;
}
.center {
margin: 0 auto;
width: 800px;
}
#tab tr {
height: 150px;
}
#tab tr td,
th {
width: 150px;
}
</style>
</head>
<body>
<div class="main">
<div class="top">
<select id="nian" class="float" onchange="huan()">
</select>
<span class="float">年</span>
<select id="yue" class="float" onchange="huan()">
</select>
<span class="float">月</span>
</div>
</div>
<div class="center">
<table id="tab" border="" cellspacing="" cellpadding="">
<tr>
<th>周日</th>
<th>周一</th>
<th>周二</th>
<th>周三</th>
<th>周四</th>
<th>周五</th>
<th>周六</th>
</tr>
</table>
</div>
<script type="text/javascript">
var tab = document.getElementById("tab");
window.onload = function() {
var nian = document.getElementById("nian");
var yue = document.getElementById("yue");
for (var i = 2019; i >= 1970; i--) {
var sel = document.createElement("option");
sel.value = i;
sel.innerText = i;
nian.appendChild(sel);
}
for (var i = 1; i <= 12; i++) {
var sel = document.createElement("option");
sel.value = i;
sel.innerText = i;
yue.appendChild(sel);
}
huan();
}
function huan() {
var week = 0;//周几
var day = 1;//从第一天开始
var days = 30;//这个月一共有几天
// try{
// var ziji=document.getElementsByTagName("td")[0];
// ziji.parentElement.parentElement.removeChild(ziji.parentElement);
// }catch(e){
// //TODO handle the exception
// }
try{
//添加一个add1的类，方便删除
var dataa=document.getElementsByClassName("add1");
for(var i=0;i<dataa.length;){
dataa[0].remove();
}
}catch(e){
//TODO handle the exception
}
var nian = document.getElementById("nian").value;
var yue = document.getElementById("yue").value;
var date = new Date(nian + "-" + yue + "-1");
//计算这个月有多少天
var data = new Date(nian,yue,0);
days=data.getDate();
// alert(days)
var newtr = document.createElement("tr");
newtr.classList.add("add1");
for (var i = 0; i < date.getDay(); i++) {
if (week == 7) {
week = 0;
}
var newtd = document.createElement("td");
newtr.appendChild(newtd);
week++;
}
if (week <= 6) {
for (; week <= 6; week++, day++) {
var newtd = document.createElement("td");
newtd.innerText = day;
newtd.value = day;
newtr.appendChild(newtd);
}
}
tab.appendChild(newtr);
week = 0;
newtr = document.createElement("tr");
newtr.classList.add("add1");
for (; day <= days; day++, week++) {
if (week == 7) {
week = 0;
tab.appendChild(newtr);
newtr = document.createElement("tr");
newtr.classList.add("add1");
}
var newtd = document.createElement("td");
newtd.innerText = day;
newtd.value = day;
newtr.appendChild(newtd);
}
tab.appendChild(newtr);
}
</script>
</body>
</html>
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