题目：仿京东显示密码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
body{
text-align: center;
}
input{
height:30px;
width:300px;
margin-top:5px;
}
#btn{
height:20px;
width:200px;
background:pink;
border: none;
}
img{
width:20px;
position:absolute;
top:135px;
left:950px;
}
</style>
</head>
<body>
<h1>京东登录</h1>
<form>
用户名：<input type="text" id="username" placeholder="用户名/邮箱/已验证手机"></br>
密码：<input type="password" id="pwd" placeholder="输入密码:"><img src="imgs/close.png"></br>
<input type="submit" id="btn" value="登录">
</form>
<script>
var img = document.querySelector("img");
var obj = document.getElementById("pwd")
img.onclick = function(){
if(obj.type=="password"){
img.src="imgs/open.png"
pwd.type="text"
}else{
img.src="imgs/close.png"
pwd.type="password"
}
}
</script>
</body>
</html>
二、题目：密码框格式提示错误信息
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
body{
text-align: center;
}
</style>
</head>
<body>
设置密码：<input type="password" id="pwd">
<img src="">
<label id="hint"></label>
<script>
var pwd = document.getElementById("pwd")
var img = document.querySelector("img")
var hint = document.getElementById("hint")
pwd.onblur = function(){
var length = pwd.value.length;
if(length>=6&&length<=16){
img.src="imgs/right.png"
hint.innerHTML="密码符合规范"
}else{
img.src="imgs/wrong.png"
hint.innerHTML="密码不符合规范，请重新输入"
}
}
</script>
</body>
</html>
三、题目：tab切换
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
li {
list-style-type: none;
}
.tab {
width: 978px;
margin: 100px auto;
}
.tab_list {
height: 39px;
border: 1px solid #ccc;
background-color: #f1f1f1;
}
.tab_list li {
float: left;
height: 39px;
line-height: 39px;
padding: 0 20px;
text-align: center;
cursor: pointer;
}
.tab_list .current {
background-color: #c81623;
color: #fff;
}
.item_info {
padding: 20px 0 0 20px;
}
.item {
display: none;
}
</style>
</head>
<body>
<div class="tab">
<div class="tab_list">
<ul>
<li class="current">商品介绍</li>
<li id="cc">规格与包装</li>
<li>售后保障</li>
<li>商品评价（50000）</li>
<li>手机社区</li>
</ul>
</div>
<div class="tab_con">
<div class="item" style="display: block;">
商品介绍模块内容
</div>
<div class="item">
规格与包装模块内容
</div>
<div class="item">
售后保障模块内容
</div>
<div class="item">
商品评价（50000）模块内容
</div>
<div class="item">
手机社区模块内容
</div>
</div>
</div>
<script>
var tab_list = document.querySelector('.tab_list');
var lis = tab_list.querySelectorAll('li');
var items = document.querySelectorAll('.item');
for (var i = 0; i < lis.length; i++) {
lis[i].setAttribute('index', i);//自定义属性
//鼠标经过时触发
// 首先全部清空
lis[i].onmouseover = function() {
for (var i = 0; i < lis.length; i++) {
lis[i].className = '';
}
// 只把当前的给效果
this.className = 'current';
// 上半部分结束
var index = this.getAttribute('index');
console.log(index);
for (var i = 0; i < items.length; i++) {
//所有的都隐藏
items[i].style.display = 'none';
}
//当前显示
items[index].style.display = 'block';
}
}
</script>
</body>
</html>