vue实现登录拦截

本文实例为大家分享了vue实现登录拦截的具体代码，供大家参考，具体内容如下

需求：用户只有登录了，用户名存储在本地储存时，才能进入首页，如果本地存储没有用户名，就不能进入首页

1、登录页面的实现

<template>
<div class="htmleaf-container">
<div class="demo form-bg">
 <div class="container">
 <div class="row">
  <div class="col-md-offset-3 col-md-6">
  <form class="form-horizontal">
   <span class="heading">用户登录</span>
   <div class="form-group">
   <input type="text" class="form-control" id="inputtxt" placeholder="用户名" v-model="username" @blur="inputUserBlur" @focus="inputFocus">
   <i class="fa fa-user"></i>
   </div>
   <div class="form-group help">
   <input type="password" class="form-control" id="inputPassword3" placeholder="密码" v-model="psd" @blur="inputPsdBlur">
   <i class="fa fa-lock"></i>
   <a href="#" rel="external nofollow" class="fa fa-question-circle"></a>
   </div>
   <div class="form-group">
   <div class="main-checkbox">
    <input type="checkbox" value="None" id="checkbox1" name="check"/>
    <label for="checkbox1"></label>
   </div>
   <span class="text">记住我</span>
   <button type="button" class="btn btn-default" @click="loginBtn">立刻登录</button>
   </div>
  </form>
  </div>
 </div>
 </div>
</div>
</div>
</template>

<style lang="less" scoped>
@import 'http://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css';
@import 'http://cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css';
@import '.././assets/login/css/index.css';
.form-bg{
padding: 2em 0;
}
.form-horizontal{
background: #fff;
padding-bottom: 40px;
border-radius: 15px;
text-align: center;
}
.form-horizontal .heading{
display: block;
font-size: 35px;
font-weight: 700;
padding: 35px 0;
border-bottom: 1px solid #f0f0f0;
margin-bottom: 30px;
}
.form-horizontal .form-group{
padding: 0 40px;
margin: 0 0 25px 0;
position: relative;
}
.form-horizontal .form-control{
background: #f0f0f0;
border: none;
border-radius: 20px;
box-shadow: none;
padding: 0 20px 0 45px;
height: 40px;
transition: all 0.3s ease 0s;
}
.form-horizontal .form-control:focus{
background: #e0e0e0;
box-shadow: none;
outline: 0 none;
}
.form-horizontal .form-group i{
position: absolute;
top: 12px;
left: 60px;
font-size: 17px;
color: #c8c8c8;
transition : all 0.5s ease 0s;
}
.form-horizontal .form-control:focus + i{
color: #00b4ef;
}
.form-horizontal .fa-question-circle{
display: inline-block;
position: absolute;
top: 12px;
right: 60px;
font-size: 20px;
color: #808080;
transition: all 0.5s ease 0s;
}
.form-horizontal .fa-question-circle:hover{
color: #000;
}
.form-horizontal .main-checkbox{
float: left;
width: 20px;
height: 20px;
background: #11a3fc;
border-radius: 50％;
position: relative;
margin: 5px 0 0 5px;
border: 1px solid #11a3fc;
}
.form-horizontal .main-checkbox label{
width: 20px;
height: 20px;
position: absolute;
top: 0;
left: 0;
cursor: pointer;
}
.form-horizontal .main-checkbox label:after{
content: "";
width: 10px;
height: 5px;
position: absolute;
top: 5px;
left: 4px;
border: 3px solid #fff;
border-top: none;
border-right: none;
background: transparent;
opacity: 0;
-webkit-transform: rotate(-45deg);
transform: rotate(-45deg);
}
.form-horizontal .main-checkbox input[type=checkbox]{
visibility: hidden;
}
.form-horizontal .main-checkbox input[type=checkbox]:checked + label:after{
opacity: 1;
}
.form-horizontal .text{
float: left;
margin-left: 7px;
line-height: 20px;
padding-top: 5px;
text-transform: capitalize;
}
.form-horizontal .btn{
float: right;
font-size: 14px;
color: #fff;
background: #00b4ef;
border-radius: 30px;
padding: 10px 25px;
border: none;
text-transform: capitalize;
transition: all 0.5s ease 0s;
}
@media only screen and (max-width: 479px){
.form-horizontal .form-group{
 padding: 0 25px;
}
.form-horizontal .form-group i{
 left: 45px;
}
.form-horizontal .btn{
 padding: 10px 20px;
}
}
</style>

index.css

/* @font-face {
font-family: 'icomoon';
src:url('../fonts/icomoon.eot?rretjt');
src:url('../fonts/icomoon.eot?#iefixrretjt') format('embedded-opentype'),
url('../fonts/icomoon.woff?rretjt') format('woff'),
url('../fonts/icomoon.ttf?rretjt') format('truetype'),
url('../fonts/icomoon.svg?rretjt#icomoon') format('svg');
font-weight: normal;
font-style: normal;
} */

[class^="icon-"], [class*=" icon-"] {
font-family: 'icomoon';
speak: none;
font-style: normal;
font-weight: normal;
font-variant: normal;
text-transform: none;
line-height: 1;

/* Better Font Rendering =========== */
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}

body, html { font-size: 100％; padding: 0; margin: 0;}

/* Reset */
*,
*:after,
*:before {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}

/* Clearfix hack by Nicolas Gallagher: http://nicolasgallagher.com/micro-clearfix-hack/ */
.clearfix:before,
.clearfix:after {
content: " ";
display: table;
}

.clearfix:after {
clear: both;
}

body{
background: #494A5F;
font-weight: 500;
font-size: 1.05em;
font-family: "Microsoft YaHei","Segoe UI", "Lucida Grande", Helvetica, Arial,sans-serif;
}
a{ color: rgba(255, 255, 255, 0.6);outline: none;text-decoration: none;-webkit-transition: 0.2s;transition: 0.2s;}
a:hover,a:focus{color:#74777b;text-decoration: none;}
.htmleaf-container{
margin: 0 auto;
}

.bgcolor-1 { background: #f0efee; }
.bgcolor-2 { background: #f9f9f9; }
.bgcolor-3 { background: #e8e8e8; }/*light grey*/
.bgcolor-4 { background: #2f3238; color: #fff; }/*Dark grey*/
.bgcolor-5 { background: #df6659; color: #521e18; }/*pink1*/
.bgcolor-6 { background: #2fa8ec; }/*sky blue*/
.bgcolor-7 { background: #d0d6d6; }/*White tea*/
.bgcolor-8 { background: #3d4444; color: #fff; }/*Dark grey2*/
.bgcolor-9 { background: #ef3f52; color: #fff;}/*pink2*/
.bgcolor-10{ background: #64448f; color: #fff;}/*Violet*/
.bgcolor-11{ background: #3755ad; color: #fff;}/*dark blue*/
.bgcolor-12{ background: #3498DB; color: #fff;}/*light blue*/
.bgcolor-20{ background: #494A5F;color: #D5D6E2;}
/* Header */
.htmleaf-header{
padding: 1em 190px 1em;
letter-spacing: -1px;
text-align: center;
background: #66677c;
}
.htmleaf-header h1 {
color: #D5D6E2;
font-weight: 600;
font-size: 2em;
line-height: 1;
margin-bottom: 0;
}
.htmleaf-header h1 span {
display: block;
font-size: 60％;
font-weight: 400;
padding: 0.8em 0 0.5em 0;
color: #c3c8cd;
}
/*nav*/
.htmleaf-demo a{color: #fff;text-decoration: none;}
.htmleaf-demo{width: 100％;padding-bottom: 1.2em;}
.htmleaf-demo a{display: inline-block;margin: 0.5em;padding: 0.6em 1em;border: 3px solid #fff;font-weight: 700;}
.htmleaf-demo a:hover{opacity: 0.6;}
.htmleaf-demo a.current{background:#1d7db1;color: #fff; }
/* Top Navigation Style */
.htmleaf-links {
position: relative;
display: inline-block;
white-space: nowrap;
font-size: 1.5em;
text-align: center;
}

.htmleaf-links::after {
position: absolute;
top: 0;
left: 50％;
margin-left: -1px;
width: 2px;
height: 100％;
background: #dbdbdb;
content: '';
-webkit-transform: rotate3d(0,0,1,22.5deg);
transform: rotate3d(0,0,1,22.5deg);
}

.htmleaf-icon {
display: inline-block;
margin: 0.5em;
padding: 0em 0;
width: 1.5em;
text-decoration: none;
}

.htmleaf-icon span {
display: none;
}

.htmleaf-icon:before {
margin: 0 5px;
text-transform: none;
font-weight: normal;
font-style: normal;
font-variant: normal;
font-family: 'icomoon';
line-height: 1;
speak: none;
-webkit-font-smoothing: antialiased;
}
/* footer */
.htmleaf-footer{width: 100％;padding-top: 10px;}
.htmleaf-small{font-size: 0.8em;}
.center{text-align: center;}
/****/
.related {
color: #fff;
background: #494A5F;
text-align: center;
font-size: 1.25em;
padding: 0.5em 0;
overflow: hidden;
}

.related > a {
vertical-align: top;
width: calc(100％ - 20px);
max-width: 340px;
display: inline-block;
text-align: center;
margin: 20px 10px;
padding: 25px;
font-family: "Microsoft YaHei","宋体","Segoe UI", "Lucida Grande", Helvetica, Arial,sans-serif, FreeSans, Arimo;
}
.related a {
display: inline-block;
text-align: left;
margin: 20px auto;
padding: 10px 20px;
opacity: 0.8;
-webkit-transition: opacity 0.3s;
transition: opacity 0.3s;
-webkit-backface-visibility: hidden;
}

.related a:hover,
.related a:active {
opacity: 1;
}

.related a img {
max-width: 100％;
opacity: 0.8;
border-radius: 4px;
}
.related a:hover img,
.related a:active img {
opacity: 1;
}
.related h3{font-family: "Microsoft YaHei", sans-serif;font-size: 1.2em}
.related a h3 {
font-size: 0.85em;
font-weight: 300;
margin-top: 0.15em;
color: #fff;
}
/* icomoon */
.icon-htmleaf-home-outline:before {
content: "\e5000";
}

.icon-htmleaf-arrow-forward-outline:before {
content: "\e5001";
}

@media screen and (max-width: 1024px) {
.htmleaf-header {
padding: 2em 10％ 2em;
}
.htmleaf-header h1 {
font-size:1.4em;
}
.htmleaf-links{font-size: 1.4em}
}

@media screen and (max-width: 960px) {
.htmleaf-header {
padding: 2em 10％ 2em;
}
.htmleaf-header h1 {
font-size:1.2em;
}
.htmleaf-links{font-size: 1.2em}
.related h3{font-size: 1em;}
.related a h3 {
font-size: 0.8em;
}
}

@media screen and (max-width: 766px) {
.htmleaf-header h1 {
font-size:1.3em;
}
.htmleaf-links{font-size: 1.3em}
}

@media screen and (max-width: 640px) {
.htmleaf-header {
padding: 2em 10％ 2em;
}
.htmleaf-header h1 {
font-size:1em;
}
.htmleaf-links{font-size: 1em}
.related h3{font-size: 0.8em;}
.related a h3 {
font-size: 0.6em;
}
}

首先首页需要用户登录成功，且本地有username的存储，才能进入首页，那么就要在首页的路由中配置拦截。

1、首页路由

{
path: '/',
name: 'home',
component: Home,
meta: {
requireAuth: true //配置拦截
},
},

2、登录页面路由

{
path: '/login',
name: 'login',
component: () => import(/* webpackChunkName: "about" */ '../views/Login.vue')
}

路由钩子函数

router.beforeEach((to,from,next)=>{
if(to.meta.requireAuth){
if(localStorage.getItem('username')){
next();
}else{
next({
path:'/login'
})
}
}else{
next();
}
})

登录页面的验证：

<script>
export default {
name: 'login',
data() {
return {
 username:"",
 psd:'',
 userKey:false,
 psdKey:false
}
},

methods: {
//用户名验证
inputUserBlur(){
 let filter = /^[a-zA-Z0-9_]{6,16}$/;
 console.log('blur');
 if(this.username.trim() == ''){
 this.$message.error('用户名不能为空');
 }else if(!filter.test(this.username)){
 this.$message({
  message: '用户名格式错误(6到16位，字母数字下划线，减号,中间不能有空格)',
  type: 'warning'
 });
 }else{
 this.userKey = true;//用户名格式正确
 }
},
//密码验证
inputPsdBlur(){
 let filter = /^(?![0-9]+$)(?![a-z]+$)(?![A-Z]+$)(?!([^(0-9a-zA-Z)])+$).{6,20}$/;
 console.log('blur');
 if(this.psd.trim() == ''){
 this.$message.error('密码不能为空');
 }else if(!filter.test(this.psd)){
 this.$message({
  message: '密码格式错误(密码包含 数字,英文,字符中的两种以上，长度6-20)',
  type: 'warning'
 });
 }else{
 this.psdKey = true;//密码格式正确
 }
},
//登录
loginBtn(){
 console.log(this.userKey,this.psdKey)
 if(this.userKey && this.psdKey){
 this.$message({
 message: '恭喜你，登录成功',
 type: 'success'
 });
 localStorage.setItem('username',JSON.stringify(this.username));
 this.username = '';
 this.psd = '';
 this.$router.push('/')
 }else{
 this.$message.error('用户名和密码不能为空');
 }
}
},
}
</script>

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来源：https://blog.csdn.net/Hhjian524/article/details/104053861