倒计时
function countDown(time) {
var nowTime = +new Date();
var inputTime = +new Date(time);
var times = (inputTime - nowTime) / 1000;
var d = parseInt(times / 60 / 60 / 24);
d = d < 10 ? '0' + d : d;
var h = parseInt(times / 60 / 60 % 24);
h = h < 10 ? '0' + h : h;
var m = parseInt(times / 60 % 60);
m = m < 10 ? '0' + m : m;
var s = parseInt(times % 60);
s = s < 10 ? '0' + s : s;
return d + '天' + h + '时' + m + '分' + s + '秒';
}
console.log(countDown('2023-3-19 21:00:00'));
var date = new Date();
console.log(date
);
动态生成表格
<style>
table {
width: 500px;
margin: 100px auto;
border-collapse: collapse;
text-align: center;
}
td,
th {
border: 1px solid #333;
}
thead tr {
height: 40px;
background-color: #ccc;
}
</style>
</head>
<body>
<table cellspacing="0">
<thead>
<tr>
<th>姓名</th>
<th>科目</th>
<th>成绩</th>
<th>姓名</th>
<th>姓名</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
//先准备好数据
var datas = [{
name: '小王',
subject: 'JavaScript',
score: 100,
scor: 100
}, {
name: '小张',
subject: 'JavaScript',
score: 98,
scor: 100
}, {
name: '小赵',
subject: 'JavaScript',
score: 99,
scor: 100
}];
//往tbody里创建行
var tbody = document.querySelector('tbody');
for (var i = 0; i < datas.length; i++) {
var tr = document.createElement('tr');
tbody.appendChild(tr);
//行里面创建单元格
for (var k in datas[i]) {
//创建单元格
var td = document.createElement('td');
td.innerHTML = datas[i][k];
tr.appendChild(td);
}
//创建有删除的单元格
var td = document.createElement('td');
td.innerHTML = '<a href="javascript:;">删除</a>';
tr.appendChild(td);
}
var as = document.querySelectorAll('a');
for (var i = 0; i < as.length; i++) {
as[i].onclick = function () {
tbody.removeChild(this.parentNode.parentNode);
}
}
发布留言
<style>
li a {
float: right;
}
</style>
</head>
<body>
<textarea name="" id="">123</textarea>
<button>发布</button>
<ul>
<li>
123
</li>
</ul>
<script>
//获取元素
var btn = document.querySelector('button');
var text = document.querySelector('textarea');
var ul = document.querySelector('ul');
//注册事件
btn.onclick = function () {
//创建元素
if (text.value == '') {
alert('您没有输入内容');
return false;
} else {
var li = document.createElement('li');
//添加元素
li.innerHTML = text.value + "<a href='javascript:'>删除</a>";
ul.insertBefore(li, ul.children[0]);
//删除元素
var as = document.querySelectorAll('a');
for (var i = 0; i < as.length; i++) {
as[i].onclick = function () {
ul.removeChild(this.parentNode);
}
}
}
}
密码框验证
<style>
div {
width: 600px;
margin: 100px auto;
}
.message {
display: inline-block;
font-size: 12px;
color: #999;
background: url(images\Snipaste_2023-03-19_11-22-17.png) no-repeat left center;
padding-left: 20px;
}
.wrong {
color: red;
background-image: url(images\Snipaste_2023-03-19_11-22-17.png);
}
.right {
color: green;
background-image: url(images\Snipaste_2023-03-19_11-22-17.png);
}
</style>
</head>
<body>
<div class="register">
<input type="password" class="ipt">
<p class="message">请输入6~16位密码</p>
</div>
<script>
//获取元素
var ipt = document.querySelector('.ipt');
var message = document.querySelector('.message');
//注册事件,失去焦点
ipt.onblur = function () {
if (this.value.length < 6 || this.value.length > 16) {
message.className = 'message wrong'; //改变类名
message.innerHTML = '您输入的位数不对';
} else {
message.className = 'message right'; //改变类名
message.innerHTML = '正确输入';
}
}
模态框拖拽
<style>
.login-header {
width: 100%;
text-align: center;
height: 30px;
font-size: 24px;
line-height: 30px;
}
ul,
li,
ol,
dl,
dt,
dd,
div,
p,
span,
h1,
h2,
h3,
h4,
h5,
h6,
a {
padding: 0px;
margin: 0px;
}
.login {
display: none;
width: 512px;
height: 280px;
position: fixed;
border: #ebebeb solid 1px;
left: 50%;
top: 50%;
background: #ffffff;
box-shadow: 0px 0px 20px #ddd;
z-index: 9999;
transform: translate(-50%, -50%);
}
.login-title {
width: 100%;
margin: 10px 0px 0px 0px;
text-align: center;
line-height: 40px;
height: 40px;
font-size: 18px;
position: relative;
cursor: move;
}
.login-input-content {
margin-top: 20px;
}
.login-button {
width: 50%;
margin: 30px auto 0px auto;
line-height: 40px;
font-size: 14px;
border: #ebebeb 1px solid;
text-align: center;
}
.login-bg {
display: none;
width: 100%;
height: 100%;
position: fixed;
top: 0px;
left: 0px;
background: rgba(0, 0, 0, .3);
}
a {
text-decoration: none;
color: #000000;
}
.login-button a {
display: block;
}
.login-input input.list-input {
float: left;
line-height: 35px;
height: 35px;
width: 350px;
border: #ebebeb 1px solid;
text-indent: 5px;
}
.login-input {
overflow: hidden;
margin: 0px 0px 20px 0px;
}
.login-input label {
float: left;
width: 90px;
padding-right: 10px;
text-align: right;
line-height: 35px;
height: 35px;
font-size: 14px;
}
.login-title span {
position: absolute;
font-size: 12px;
right: -20px;
top: -30px;
background: #ffffff;
border: #ebebeb solid 1px;
width: 40px;
height: 40px;
border-radius: 20px;
}
</style>
</head>
<body>
<div class="login-header"><a id="link" href="javascript:;">点击，弹出登录框</a></div>
<div id="login" class="login">
<div id="title" class="login-title">登录会员
<span><a id="closeBtn" href="javascript:void(0);" class="close-login">关闭</a></span>
</div>
<div class="login-input-content">
<div class="login-input">
<label>用户名：</label>
<input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input">
</div>
<div class="login-input">
<label>登录密码：</label>
<input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input">
</div>
</div>
<div id="loginBtn" class="login-button"><a href="javascript:void(0);" id="login-button-submit">登录会员</a></div>
</div>
<!-- 遮盖层 -->
<div id="bg" class="login-bg"></div>
<script>
// 1. 获取元素
var login = document.querySelector('.login');
var mask = document.querySelector('.login-bg');
var link = document.querySelector('#link');
var closeBtn = document.querySelector('#closeBtn');
var title = document.querySelector('#title');
// 2. 点击弹出层这个链接 link 让mask 和login 显示出来
link.addEventListener('click', function() {
mask.style.display = 'block';
login.style.display = 'block';
})
// 3. 点击 closeBtn 就隐藏 mask 和 login
closeBtn.addEventListener('click', function() {
mask.style.display = 'none';
login.style.display = 'none';
})
// 4. 开始拖拽
// (1) 当我们鼠标按下， 就获得鼠标在盒子内的坐标
title.addEventListener('mousedown', function(e) {
var x = e.pageX - login.offsetLeft;
var y = e.pageY - login.offsetTop;
// (2) 鼠标移动的时候，把鼠标在页面中的坐标，减去 鼠标在盒子内的坐标就是模态框的left和top值
document.addEventListener('mousemove', move)
function move(e) {
login.style.left = e.pageX - x + 'px';
login.style.top = e.pageY - y + 'px';
}
// (3) 鼠标弹起，就让鼠标移动事件移除
document.addEventListener('mouseup', function() {
document.removeEventListener('mousemove', move);
})
})
</script>
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