JS听到了强运的回响
正则表达式
介绍
正则表达式是用于匹配字符串中字符组合的模式,在JS中,正则表达式也是对象
通常用来查找,替换那些符合正则表达式的文本
就是筛选出符合条件的一类人
比如说
有人喜欢玩艾斯爱慕,那他喜欢的就是这一类人,而不是某个人
正则表达式在JS中的使用场景
验证表单:用户表单只能输入英文字母、数字或者下划线,昵称输入框中可以输入中文匹配
可以过滤到页面中的一些敏感词(替换),或者从字符串中获取我们想要的特定部分
语法
我们想要根据规则去查找,如果找到就返回
正则同样的规则:
定义规则、查找
let str = 'S,M,艾斯爱慕'
JS中定义正则表达式的语法有两种,我们先学习其中比较简单的方法
count 变量名 = /表达式/
//是正则表达式字面量
我们这样判断是否有符合规则的字符串
test()方法可以查看正则表达式与指定的字符串是否匹配
regObj.test(被检测的字符串)
这是使用实例:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
const str = 'SM,S,M,艾斯爱慕'
const reg = /M/
console.log(reg.test(str)) //true
</script>
</body>
</html>
还有一个方法:exec()方法在一个指定字符串中执行一个搜索匹配
语法:
regObj.exec(被检测字符串)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
const str = 'SM,S,M,艾斯爱慕'
const reg = /M/
console.log(reg.exec(str)) //true
</script>
</body>
</html>
如果匹配成功,exec()方法返回一个数组,否则返回null
元字符
什么是元字符?
使用元字符有什么好处?
大多数的字符仅能够描述它们本身,这些字符称作普通字符,比如所有的字母和数字
普通字符只能够匹配字符串中与他们相同的字符
元字符是一些有特殊含义的字符,提高了灵活性和强大的匹配功能
比如:规定用户只能输入英文26个字母
元字符写法:[a-z]
参考文档:
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions
正则测试工具:
为了方便记忆和学习,元字符有这样的分类:
来看看边界符:是正则表达式中用来提示字符所处的位置,主要有两个字符
如果 ^ 和 $ 在一起,表示必须是精确匹配(孩子们这不是makefile吗)
正则表达式中的边界符(位置符)用来提示字符所处的位置,主要有两个字符
这就是边界符,来看看量词:
量词是表示重复次数
用来设定某个模式出现的次数
逗号左右两侧千万不要出现空格
简洁记法:
字符类
[ ]匹配字符集合
后面的字符串只要包含abc中任意一个字符都返回true
[ ] 里面加上 - 连字符,使用连字符 - 表示一个范围
比如:
综合示例:
来看看字符类的:
[ ] 里面加上 ^ 取反符号
比如:
[^a-z] 匹配除了小写字母以外的字符
注意要写到中括号里面
. 表示匹配除换行符之外的任何单个字符
用户名验证案例
需求:
nextElementSibling是获取下一个兄弟元素(边学边忘)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
span {
display: inline-block;
width: 250px;
height: 30px;
vertical-align: middle;
line-height: 30px;
padding-left: 15px;
}
.error {
color: red;
background: url(./images/error1.png) no-repeat left center;
}
.right {
color: green;
background: url(./images/right.png) no-repeat left center;
}
</style>
</head>
<body>
<input type="text">
<span></span>
<script>
const reg = /^[a-zA-Z0-9-_]{6,16}$/
const input = document.querySelector('input')
const span = input.nextElementSibling
input.addEventListener('blur',function(){
if(reg.test(this.value))
{
span.innerHTML = '输入正确'
span.className='right'
}
else{
span.innerHTML = '请输入正确的格式'
span.className = 'error'
}
})
</script>
</body>
</html>
昵称案例
我们需要要求用户只能输入中文:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
span {
display: inline-block;
width: 250px;
height: 30px;
vertical-align: middle;
line-height: 30px;
padding-left: 15px;
}
.error {
color: red;
background: url(./images/error1.png) no-repeat left center;
}
.right {
color: green;
background: url(./images/right.png) no-repeat left center;
}
</style>
</head>
<body>
<input type="text">
<span></span>
<script>
const reg = /^[\u4e00-\u9fa5]{2,8}$/
const input = document.querySelector('input')
const span = input.nextElementSibling
input.addEventListener('blur', function () {
if (reg.test(this.value)) {
span.innerHTML = '输入正确'
span.className = 'right'
}
else {
span.innerHTML = '请输入正确的格式'
span.className = 'error'
}
})
</script>
</body>
</html>
预定义:指的是某些常见模式的简写方法
就像是,记得的时候用不上,用上的时候已经忘
修饰符
修饰符约束正则执行的某些细节行为,比如是否区分大小写,是否支持多行匹配等
语法:
/表达式/修饰符
i 是单词 ignore 的缩写,正则匹配时字母不区分大小写
g 是单词 global 的缩写,匹配所有满足正则表达式的结果
替换replace:
字符串.replace(/正则表达式/,'替换的文本')
过滤敏感字(不是,前端都在干些什么得罪人的活,广告跳转,多少秒之后才关闭,屏蔽敏感字。。。步道乐跑我恨你)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<textarea name="" cols="30" rows="10" id=""></textarea>
<button>发布</button>
<div></div>
<script>
const tx = document.querySelector('textarea')
const btn = document.querySelector('button')
const div = document.querySelector('div')
btn.addEventListener('click',function(){
console.log(tx.value)
tx.value.replace(/我操|寄吧|草泥马|傻逼|妈的/,'**')
div.innerHTML = tx.value.replace(/我操|寄吧|草泥马|傻逼|妈的/g,'**')
})
</script>
</body>
</html>
综合案例
来仿写一个小兔仙儿的页面注册
让我们来分析一下业务模块:
短信验证码
需求一:
我们需要注意的是在点击的时候如果时间未到,那应该先禁用一下点击按钮的,,
我们可以通过一个变量进行控制
<script>
// 发送短信验证码模块
const code = document.querySelector('.code')
let flag = true
// 点击事件
code.addEventListener('click', function () {
if (flag) {
flag = false
let i = 5
code.innerHTML = `0${i}秒后重新获取`
let timeId = setInterval(function () {
i--
code.innerHTML = `0${i}秒后重新获取`
if (i === 0) {
flag = true
clearInterval(timeId)
code.innerHTML = `重新获取`
}
}, 1000)
}
})
</script>
验证用户名模块
需求:
//验证的是用户名
// 获取用户表单
const username = document.querySelector('[name=username]')
// 使用change事件, 值发生变化的时候
username.addEventListener('change',verifyName)
// 封装函数
function verifyName(){
const span = username.nextElementSibling
// 定规则
const reg = /^[a-zA-Z0-9-_]{6,10}$/
if(!reg.test(username.value))
{
span.innerHTML='输入不合法,请输入6~10位'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
验证手机号和密码框
让我们来看看这个捏
//验证码验证
// 获取手机表单
const codeInput = document.querySelector('[name=code]')
// 使用change事件, 值发生变化的时候
codeInput.addEventListener('change',verifycodeInput)
// 封装函数
function verifycodeInput(){
const span = codeInput.nextElementSibling
// 定规则
const reg = /^\d{6}$/
if(!reg.test(codeInput.value))
{
span.innerHTML='输入不合法,请输入6位数字'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
// 密码验证
// 获取手机表单
const password= document.querySelector('[name=password]')
// 使用change事件, 值发生变化的时候
password.addEventListener('change',verifypassword)
// 封装函数
function verifypassword(){
const span = password.nextElementSibling
// 定规则
const reg = /^[a-zA-Z0-9-_]{6,20}$/
if(!reg.test(password.value))
{
span.innerHTML='输入不合法,请输入6~20位数字,字母,符号组成的密码'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
// 密码再次验证
// 获取手机表单
const confirm= document.querySelector('[name=confirm]')
// 使用change事件, 值发生变化的时候
confirm.addEventListener('change',verifyPwd)
// 封装函数
function verifyPwd(){
const span = confirm.nextElementSibling
if(confirm.value !== password.value)
{
span.innerHTML='输入不一致'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
我同意和提交模块
接下来做我同意模块,又想到了。。。流氓软件
//我同意模块
const agree = document.querySelector('.icon-queren')
agree.addEventListener('click',function(){
//切换类 原有的就删掉,没有就添加
this.classList.toggle('icon-queren2')
})
//提交模块
const form = document.querySelector('form')
form.addEventListener('submit',function(e){
//判断是否勾选我同意模块,如果有就证明勾选了,没有就是没有
if(!agree.classList.contains('icon-queren2')){
return alert('请勾选同意协议')
// 阻止提交
e.preventDefault()
}
// 依次判断上面的每个框框,是否通过,只有一个没通过的就阻止
if(!verifyName()) e.preventDefault()
if(!verifyPhone()) e.preventDefault()
if(!verifyPwd()) e.preventDefault()
if(!verifycodeInput()) e.preventDefault()
if(!verifypassword()) e.preventDefault()
})
全部代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>小兔鲜儿 - 新鲜 惠民 快捷!</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<link rel="shortcut icon" href="./favicon.ico">
<link rel="stylesheet" href="./css/common.css">
<link rel="stylesheet" href="./css/register.css">
<link rel="stylesheet" href="https://at.alicdn.com/t/font_2143783_iq6z4ey5vu.css">
</head>
<body>
<!-- 项部导航 -->
<div class="xtx_topnav">
<div class="wrapper">
<!-- 顶部导航 -->
<ul class="xtx_navs">
<li>
<a href="./login.html">请先登录</a>
</li>
<li>
<a href="./register.html">免费注册</a>
</li>
<li>
<a href="./center-order.html">我的订单</a>
</li>
<li>
<a href="./center.html">会员中心</a>
</li>
<li>
<a href="javascript:;">帮助中心</a>
</li>
<li>
<a href="javascript:;">在线客服</a>
</li>
<li>
<a href="javascript:;">
<i class="mobile sprites"></i>
手机版
</a>
</li>
</ul>
</div>
</div>
<!-- 头部 -->
<div class="xtx_header">
<div class="wrapper">
<!-- 网站Logo -->
<h1 class="xtx_logo"><a href="/">小兔鲜儿</a></h1>
<!-- 主导航 -->
<div class="xtx_navs">
<ul class="clearfix">
<li>
<a href="./index.html">首页</a>
</li>
<li>
<a href="./category01.html">生鲜</a>
</li>
<li>
<a href="./category01.html">美食</a>
</li>
<li>
<a href="./category01.html">餐厨</a>
</li>
<li>
<a href="./category01.html">电器</a>
</li>
<li>
<a href="./category01.html">居家</a>
</li>
<li>
<a href="./category01.html">洗护</a>
</li>
<li>
<a href="./category01.html">孕婴</a>
</li>
<li>
<a href="./category01.html">服装</a>
</li>
</ul>
</div>
<!-- 站内搜索 -->
<div class="xtx_search clearfix">
<!-- 购物车 -->
<a href="./cart-none.html" class="xtx_search_cart sprites">
<i>2</i>
</a>
<!-- 搜索框 -->
<div class="xtx_search_wrapper">
<input type="text" placeholder="搜一搜" onclick="location.href='./search.html'">
</div>
</div>
</div>
</div>
<div class="xtx-wrapper">
<div class="container">
<!-- 卡片 -->
<div class="xtx-card">
<h3>新用户注册</h3>
<form class="xtx-form">
<div data-prop="username" class="xtx-form-item">
<span class="iconfont icon-zhanghao"></span>
<input name="username" type="text" placeholder="设置用户名称">
<span class="msg"></span>
</div>
<div data-prop="phone" class="xtx-form-item">
<span class="iconfont icon-shouji"></span>
<input name="phone" type="text" placeholder="输入手机号码 ">
<span class="msg"></span>
</div>
<div data-prop="code" class="xtx-form-item">
<span class="iconfont icon-zhibiaozhushibiaozhu"></span>
<input name="code" type="text" placeholder="短信验证码">
<span class="msg"></span>
<a class="code" href="javascript:;">发送验证码</a>
</div>
<div data-prop="password" class="xtx-form-item">
<span class="iconfont icon-suo"></span>
<input name="password" type="password" placeholder="设置6至20位字母、数字和符号组合">
<span class="msg"></span>
</div>
<div data-prop="confirm" class="xtx-form-item">
<span class="iconfont icon-suo"></span>
<input name="confirm" type="password" placeholder="请再次输入上面密码">
<span class="msg"></span>
</div>
<div class="xtx-form-item pl50">
<i class="iconfont icon-queren"></i>
已阅读并同意<i>《用户服务协议》</i>
</div>
<div class="xtx-form-item">
<button class="submit">下一步</button>
<!-- <a class="submit" href="javascript:;">下一步</a> -->
</div>
</form>
</div>
</div>
</div>
<!-- 公共底部 -->
<div class="xtx_footer clearfix">
<div class="wrapper">
<!-- 联系我们 -->
<div class="contact clearfix">
<dl>
<dt>客户服务</dt>
<dd class="chat">在线客服</dd>
<dd class="feedback">问题反馈</dd>
</dl>
<dl>
<dt>关注我们</dt>
<dd class="weixin">公众号</dd>
<dd class="weibo">微博</dd>
</dl>
<dl>
<dt>下载APP</dt>
<dd class="qrcode">
<img src="./uploads/qrcode.jpg">
</dd>
<dd class="download">
<span>扫描二维码</span>
<span>立马下载APP</span>
<a href="javascript:;">下载页面</a>
</dd>
</dl>
<dl>
<dt>服务热线</dt>
<dd class="hotline">
400-0000-000
<small>周一至周日 8:00-18:00</small>
</dd>
</dl>
</div>
</div>
<!-- 其它 -->
<div class="extra">
<div class="wrapper">
<!-- 口号 -->
<div class="slogan">
<a href="javascript:;" class="price">价格亲民</a>
<a href="javascript:;" class="express">物流快捷</a>
<a href="javascript:;" class="quality">品质新鲜</a>
</div>
<!-- 版权信息 -->
<div class="copyright">
<p>
<a href="javascript:;">关于我们</a>
<a href="javascript:;">帮助中心</a>
<a href="javascript:;">售后服务</a>
<a href="javascript:;">配送与验收</a>
<a href="javascript:;">商务合作</a>
<a href="javascript:;">搜索推荐</a>
<a href="javascript:;">友情链接</a>
</p>
<p>CopyRight © 小兔鲜儿</p>
</div>
</div>
</div>
</div>
<script>
// 发送短信验证码模块
const code = document.querySelector('.code')
let flag = true
// 点击事件
code.addEventListener('click', function () {
if (flag) {
flag = false
let i = 5
code.innerHTML = `0${i}秒后重新获取`
let timeId = setInterval(function () {
i--
code.innerHTML = `0${i}秒后重新获取`
if (i === 0) {
flag = true
clearInterval(timeId)
code.innerHTML = `重新获取`
}
}, 1000)
}
})
//验证的是用户名
// 获取用户表单
const username = document.querySelector('[name=username]')
// 使用change事件, 值发生变化的时候
username.addEventListener('change',verifyName)
// 封装函数
function verifyName(){
const span = username.nextElementSibling
// 定规则
const reg = /^[a-zA-Z0-9-_]{6,10}$/
if(!reg.test(username.value))
{
span.innerHTML='输入不合法,请输入6~10位'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
// 验证手机号和密码框
// 获取手机表单
const phone = document.querySelector('[name=phone]')
// 使用change事件, 值发生变化的时候
phone.addEventListener('change',verifyPhone)
// 封装函数
function verifyPhone(){
const span = phone.nextElementSibling
// 定规则
const reg = /^1(3\d|4[5-9]|5[0-35-9]|6[567]|7[0-8]|8\d|9[0-35-9])\d{8}$/
if(!reg.test(phone.value))
{
span.innerHTML='输入不合法,请输入11位手机号'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
//验证码验证
// 获取手机表单
const codeInput = document.querySelector('[name=code]')
// 使用change事件, 值发生变化的时候
codeInput.addEventListener('change',verifycodeInput)
// 封装函数
function verifycodeInput(){
const span = codeInput.nextElementSibling
// 定规则
const reg = /^\d{6}$/
if(!reg.test(codeInput.value))
{
span.innerHTML='输入不合法,请输入6位数字'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
// 密码验证
// 获取手机表单
const password= document.querySelector('[name=password]')
// 使用change事件, 值发生变化的时候
password.addEventListener('change',verifypassword)
// 封装函数
function verifypassword(){
const span = password.nextElementSibling
// 定规则
const reg = /^[a-zA-Z0-9-_]{6,20}$/
if(!reg.test(password.value))
{
span.innerHTML='输入不合法,请输入6~20位数字,字母,符号组成的密码'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
// 密码再次验证
// 获取手机表单
const confirm= document.querySelector('[name=confirm]')
// 使用change事件, 值发生变化的时候
confirm.addEventListener('change',verifyPwd)
// 封装函数
function verifyPwd(){
const span = confirm.nextElementSibling
if(confirm.value !== password.value)
{
span.innerHTML='输入不一致'
return false
}
// 合法的,就清空span
span.innerHTML = ' '
return true
}
//我同意模块
const agree = document.querySelector('.icon-queren')
agree.addEventListener('click',function(){
//切换类 原有的就删掉,没有就添加
this.classList.toggle('icon-queren2')
})
//提交模块
const form = document.querySelector('form')
form.addEventListener('submit',function(e){
//判断是否勾选我同意模块,如果有就证明勾选了,没有就是没有
if(!agree.classList.contains('icon-queren2')){
return alert('请勾选同意协议')
// 阻止提交
e.preventDefault()
}
// 依次判断上面的每个框框,是否通过,只有一个没通过的就阻止
if(!verifyName()) e.preventDefault()
if(!verifyPhone()) e.preventDefault()
if(!verifyPwd()) e.preventDefault()
if(!verifycodeInput()) e.preventDefault()
if(!verifypassword()) e.preventDefault()
})
</script>
</body>
</html>
阶段案例
登录页面
我们还要实现的是登录页面,先来实现tab栏切换
// tab栏切换,事件委托
const tab_nav = document.querySelector('.tab-nav')
const pane = document.querySelectorAll('.tab-pane')
// 事件监听
tab_nav.addEventListener('click', function (e) {
if (e.target.tagName === 'A') {
// 取消上一个
// 当前元素添加active
tab_nav.querySelector('.active').classList.remove('active')
e.target.classList.add('active')
// 显示和隐藏类
// 先干掉所有人,使用for循环
for (let i = 0; i < pane.length; i++) {
pane[i].style.display = 'none'
}
//让对应序号的大pane显示
pane[e.target.dataset.id].style.display = 'block'
}
})
然后来做点击登录可以跳转页面
// 点击提交模块
const form = document.querySelector('form')
const agree = document.querySelector('[name=agree]')
const username = document.querySelector('[name=username]')
form.addEventListener('submit',function(e){
e.preventDefault()
if(!agree.checked)
{
return alert('请勾选同意协议')
}
// 记录用户名到本地存储(没有后台数据)
localStorage.setItem('xtx-uname',username.value)
//跳转到首页
location.href = './index.html'
})
全部代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>小兔鲜儿 - 新鲜 惠民 快捷!</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<link rel="shortcut icon" href="../favicon.ico">
<link rel="stylesheet" href="./css/common.css">
<link rel="stylesheet" href="./css/login.css">
<link rel="stylesheet" href="https://at.alicdn.com/t/font_2143783_iq6z4ey5vu.css">
</head>
<body>
<!-- 登录头部 -->
<div class="xtx-login-header">
<h1 class="logo"></h1>
<a class="home" href="./index.html">进入网站首页</a>
</div>
<!-- 登录内容 -->
<div class="xtx-login-main">
<div class="wrapper">
<form action="" autocomplete="off">
<div class="box">
<div class="tab-nav">
<a href="javascript:;" class="active" data-id="0">账户登录</a>
<a href="javascript:;" data-id="1">二维码登录</a>
</div>
<div class="tab-pane">
<div class="link">
<a href="javascript:;">手机验证码登录</a>
</div>
<div class="input">
<span class="iconfont icon-zhanghao"></span>
<input required type="text" placeholder="请输入用户名称/手机号码" name="username">
</div>
<div class="input">
<span class="iconfont icon-suo"></span>
<input required type="password" placeholder="请输入密码" name="password">
</div>
<div class="agree">
<label for="my-checkbox">
<input type="checkbox" value="1" id="my-checkbox" class="remember" name="agree">
<span class="iconfont icon-xuanze"></span>
</label>
我已同意 <a href="javascript:;">《服务条款》</a href="javascript:;"> 和 <a>《服务条款》</a>
</div>
<div class="button clearfix">
<button type="submit" class="dl">登 录</button>
<!-- <a class="dl" href="./center.html">登 录</a> -->
<a class="fl" href="./forget.html">忘记密码?</a>
<a class="fr" href="./register.html">免费注册</a>
</div>
</div>
<div class="tab-pane" style="display: none;">
<img class="code" src="./images/code.png" alt="">
</div>
</div>
</form>
</div>
</div>
<!-- 登录底部 -->
<div class="xtx-login-footer">
<!-- 版权信息 -->
<div class="copyright">
<p>
<a href="javascript:;">关于我们</a>
<a href="javascript:;">帮助中心</a>
<a href="javascript:;">售后服务</a>
<a href="javascript:;">配送与验收</a>
<a href="javascript:;">商务合作</a>
<a href="javascript:;">搜索推荐</a>
<a href="javascript:;">友情链接</a>
</p>
<p>CopyRight © 小兔鲜儿</p>
</div>
</div>
<script>
// tab栏切换,事件委托
const tab_nav = document.querySelector('.tab-nav')
const pane = document.querySelectorAll('.tab-pane')
// 事件监听
tab_nav.addEventListener('click', function (e) {
if (e.target.tagName === 'A') {
// 取消上一个
// 当前元素添加active
tab_nav.querySelector('.active').classList.remove('active')
e.target.classList.add('active')
// 显示和隐藏类
// 先干掉所有人,使用for循环
for (let i = 0; i < pane.length; i++) {
pane[i].style.display = 'none'
}
//让对应序号的大pane显示
pane[e.target.dataset.id].style.display = 'block'
}
})
// 点击提交模块
const form = document.querySelector('form')
const agree = document.querySelector('[name=agree]')
const username = document.querySelector('[name=username]')
form.addEventListener('submit',function(e){
e.preventDefault()
if(!agree.checked)
{
return alert('请勾选同意协议')
}
// 记录用户名到本地存储(没有后台数据)
localStorage.setItem('xtx-uname',username.value)
//跳转到首页
location.href = './index.html'
})
</script>
</body>
</html>
首页页面
需求:
从登录页面跳转过来之后,自动显示用户名
如果点击退出,则不显示用户名
一些东西:
<script>
//获取第一个li
const li1 = document.querySelector('.xtx_navs li:first-child')
const li2 = li1.nextElementSibling
//最好做一个渲染函数
function render()
{
//读取本地存储的用户名
const uname = localStorage.getItem('xtx-uname')
if(uname)
{
li1.innerHTML = `<a href="javascript:;"><i class="iconfont icon-user"> ${uname}</i></a>`
li2.innerHTML = '<a href="javascript:;">退出登录</a>'
}
else{
li1.innerHTML = '<a href="./login.html">请先登录</a>'
li2.innerHTML = '<a href="./register.html">免费注册</a>'
}
}
render()
//点击退出登录模块
li2.addEventListener('click',function(){
// 删除本地存储的数据
localStorage.removeItem('xtx-uname')
// 重新渲染
render()
})
</script>
所有代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>小兔鲜儿 - 新鲜 惠民 快捷!</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<link rel="shortcut icon" href="./favicon.ico">
<link rel="stylesheet" href="./css/common.css">
<link rel="stylesheet" href="./css/index.css">
<link rel="stylesheet" href="https://at.alicdn.com/t/font_2143783_iq6z4ey5vu.css">
<script>
// 检测 userAgent(浏览器信息)
!(function () {
const userAgent = navigator.userAgent
// 验证是否为Android或iPhone
const android = userAgent.match(/(Android);?[\s\/]+([\d.]+)?/)
const iphone = userAgent.match(/(iPhone\sOS)\s([\d_]+)/)
// 如果是Android或iPhone,则跳转至移动站点
if (android || iphone) {
location.href = 'http://m.itcast.cn'
}
})()
</script>
</head>
<body>
<!-- 项部导航 -->
<div class="xtx_topnav">
<div class="wrapper">
<!-- 顶部导航 -->
<ul class="xtx_navs">
<li>
<a href="./login.html">请先登录</a>
</li>
<li>
<a href="./register.html">免费注册</a>
</li>
<li>
<a href="./center-order.html">我的订单</a>
</li>
<li>
<a href="./center.html">会员中心</a>
</li>
<li>
<a href="javascript:;">帮助中心</a>
</li>
<li>
<a href="javascript:;">在线客服</a>
</li>
<li>
<a href="javascript:;">
<i class="mobile sprites"></i>
手机版
</a>
</li>
</ul>
</div>
</div>
<!-- 头部 -->
<div class="xtx_header">
<div class="wrapper">
<!-- 网站Logo -->
<h1 class="xtx_logo"><a href="/">小兔鲜儿</a></h1>
<!-- 主导航 -->
<div class="xtx_navs">
<ul class="clearfix">
<li>
<a href="./index.html">首页</a>
</li>
<li>
<a href="./category01.html">生鲜</a>
</li>
<li>
<a href="./category01.html">美食</a>
</li>
<li>
<a href="./category01.html">餐厨</a>
</li>
<li>
<a href="./category01.html">电器</a>
</li>
<li>
<a href="./category01.html">居家</a>
</li>
<li>
<a href="./category01.html">洗护</a>
</li>
<li>
<a href="./category01.html">孕婴</a>
</li>
<li>
<a href="./category01.html">服装</a>
</li>
</ul>
</div>
<!-- 站内搜索 -->
<div class="xtx_search clearfix">
<!-- 购物车 -->
<a href="./cart-none.html" class="xtx_search_cart sprites">
<i>2</i>
</a>
<!-- 搜索框 -->
<div class="xtx_search_wrapper">
<input type="text" placeholder="搜一搜" onclick="location.href='./search.html'">
</div>
</div>
</div>
</div>
<!-- 分类及焦点图 -->
<div class="xtx_entry">
<div class="wrapper">
<!-- 分类 -->
<div class="xtx_category">
<!-- 顶级分类 -->
<ul class="xtx_category_super">
<li>
<a href="javascript:;">
生鲜
<small>水果</small>
<small>蔬菜</small>
</a>
<i class="sprites"></i>
</li>
<li class="active">
<a href="javascript:;">
美食
<small>面点</small>
<small>干果</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
电器
<small>数码产品</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
居家
<small>床品</small>
<small>四件套</small>
<small>被枕</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
洗护
<small>洗发洗护</small>
<small>美妆</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
孕婴
<small>奶粉</small>
<small>玩具</small>
<small>辅食</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
餐橱
<small>数码产品</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
服饰
<small>女装</small>
<small>男装</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
杂货
<small>户外</small>
<small>图书</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
品牌
<small>品牌制造</small>
</a>
<i class="sprites"></i>
</li>
</ul>
<!-- 子分类 -->
<div class="xtx_category_subset">
</div>
</div>
<!-- 焦点图 -->
<div class="xtx_banner">
<ul>
<li>
<a href="javascript:;">
<img src="./uploads/banner_1.png" alt="">
</a>
</li>
</ul>
<!-- 切换按钮 -->
<a href="javascript:;" class="prev sprites"></a>
<a href="javascript:;" class="next sprites"></a>
<!-- 指示器 -->
<div class="indicator">
<span></span>
<span></span>
<span class="active"></span>
<span></span>
<span></span>
</div>
</div>
</div>
</div>
<!-- 新鲜好物 -->
<div class="xtx_goods_new xtx_panel">
<div class="wrapper">
<!-- 面板头部 -->
<div class="xtx_panel_header">
<h3>新鲜好物<small>新鲜出炉 品质靠谱</small></h3>
<a href="./index-new.html" class="more">
查看全部<i class="sprites"></i>
</a>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_1">
<a href="javascript:;">
<img src="./uploads/new_goods_1.jpg" alt="">
<span class="name">睿米无线吸尘器F8</span>
<span class="price"><small>¥</small>899</span>
</a>
<a href="javascript:;">
<img src="./uploads/new_goods_2.jpg" alt="">
<span class="name">智能环绕3D空调</span>
<span class="price"><small>¥</small>1299</span>
</a>
<a href="javascript:;">
<img src="./uploads/new_goods_3.jpg" alt="">
<span class="name">广东软软糯米煲仔饭</span>
<span class="price"><small>¥</small>129</span>
</a>
<a href="javascript:;">
<img src="./uploads/new_goods_4.jpg" alt="">
<span class="name">罗西机械智能手表</span>
<span class="price"><small>¥</small>3399</span>
</a>
</div>
</div>
</div>
<!-- 人气推荐 -->
<div class="xtx_goods_popular xtx_panel">
<div class="wrapper">
<!-- 面板头部 -->
<div class="xtx_panel_header">
<h3>人气推荐<small>人气爆款 不容错过</small></h3>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_1">
<a href="javascript:;">
<img src="./uploads/popular_1.jpg">
<span class="title">特惠推荐</span>
<span class="alt">我猜得到 你的需要</span>
</a>
<a href="./index-hot.html">
<img src="./uploads/popular_2.jpg">
<span class="title">爆款推荐</span>
<span class="alt">人气好物推荐</span>
</a>
<a href="./index-one.html">
<img src="./uploads/popular_3.jpg">
<span class="title">场景使用一站买全</span>
<span class="alt">编辑精心整理推荐</span>
</a>
<a href="javascript:;">
<img src="./uploads/popular_4.jpg">
<span class="title">领券中心</span>
<span class="alt">发现更多超值优惠券</span>
</a>
</div>
</div>
</div>
<!-- 热门品牌 -->
<div class="xtx_goods_brand xtx_panel">
<div class="wrapper">
<div class="xtx_panel_header">
<h3>热门品牌<small>国际经典 品质保证</small></h3>
<div class="page-bar">
<a href="javascript:;" class="prev sprites"></a>
<a href="javascript:;" class="next sprites active"></a>
</div>
</div>
<!-- 商品列表 -->
<div class="xtx_goods">
<ul>
<li>
<a href="./index-brand.html">
<img src="./uploads/brand_goods_1.jpg" alt="">
</a>
<a href="./brand-list.html">
<img src="./uploads/brand_goods_2.jpg" alt="">
</a>
<a href="javascript:;">
<img src="./uploads/brand_goods_3.jpg" alt="">
</a>
<a href="javascript:;">
<img src="./uploads/brand_goods_4.jpg" alt="">
</a>
<a href="javascript:;">
<img src="./uploads/brand_goods_5.jpg" alt="">
</a>
</li>
</ul>
</div>
</div>
</div>
<!-- 分类商品 -->
<div class="xtx_goods_category xtx_panel">
<div class="wrapper">
<!-- 生鲜 -->
<div class="xtx_panel_header">
<h3>生鲜</h3>
<a href="javascript:;" class="more">
查看全部<i class="sprites"></i>
</a>
<div class="tabs-bar">
<a href="javascript:;" class="active">水果</a>
<a href="javascript:;">蔬菜</a>
<a href="javascript:;">肉禽蛋</a>
<a href="javascript:;">裤装</a>
<a href="javascript:;">衬衫</a>
<a href="javascript:;">内衣</a>
</div>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_2">
<ul class="clearfix">
<li>
<a href="javascript:;">
<img src="./uploads/fresh_goods_cover.jpg" alt="">
</a>
<div class="label">
<span>生鲜馆</span>
<span>全场3件8折</span>
</div>
</li>
<li>
<!-- 商品图片 -->
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_1.jpg" alt="">
</div>
</a>
<!-- 商品信息 -->
<div class="meta">
<p class="name">美威 智利原味三文鱼排 240g/袋 4片装</p>
<p class="flag">海鲜年货</p>
<p class="price"><small>¥</small>59</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_2.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">红功夫 麻辣小龙虾1.5kg 4-6钱/25-32只</p>
<p class="flag">火锅食材</p>
<p class="price"><small>¥</small>71.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_3.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">三都港 冷冻无公害黄花鱼 700g 2条 袋装</p>
<p class="flag">海鲜水产</p>
<p class="price"><small>¥</small>49.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_4.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">渔公码头 大连鲜食入味 即食海参 辽参刺参 调味海</p>
<p class="flag">海鲜年货</p>
<p class="price"><small>¥</small>899</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_5.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">越南进口白心火龙果4个 装 标准果 单果400-550g </p>
<p class="flag"></p>
<p class="price"><small>¥</small>29</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_6.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">广西沃柑 柑橘1.5kg</p>
<p class="flag">新鲜水果</p>
<p class="price"><small>¥</small>59</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_7.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">进口 牛油果 6个装 单果重约130-180g</p>
<p class="flag">新鲜水果</p>
<p class="price"><small>¥</small>39.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_8.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">泰国进口山竹5A级 500g </p>
<p class="flag">新鲜水果</p>
<p class="price"><small>¥</small>29.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
</ul>
</div>
<!-- 服饰 -->
<div class="xtx_panel_header">
<h3>服饰</h3>
<a href="javascript:;" class="more">
查看全部<i class="sprites"></i>
</a>
<div class="tabs-bar">
<a href="javascript:;" class="active">行李箱</a>
<a href="javascript:;">男士包袋</a>
<a href="javascript:;">女士包袋</a>
<a href="javascript:;">钱包及小提袋</a>
<a href="javascript:;">男鞋</a>
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原文地址:https://blog.csdn.net/chestnut_orenge/article/details/144176144
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