vue实现登录拦截的方法

这篇文章将为大家详细讲解有关vue实现登录拦截的方法，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

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&#63;rretjt');
 src:url('../fonts/icomoon.eot&#63;#iefixrretjt') format('embedded-opentype'),
  url('../fonts/icomoon.woff&#63;rretjt') format('woff'),
  url('../fonts/icomoon.ttf&#63;rretjt') format('truetype'),
  url('../fonts/icomoon.svg&#63;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 h2 {
 color: #D5D6E2;
 font-weight: 600;
 font-size: 2em;
 line-height: 1;
 margin-bottom: 0;
}
.htmleaf-header h2 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 h4{font-family: "Microsoft YaHei", sans-serif;font-size: 1.2em}
.related a h4 {
 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 h2 {
        font-size:1.4em;
    }
    .htmleaf-links{font-size: 1.4em}
}

@media screen and (max-width: 960px) {
 .htmleaf-header {
  padding: 2em 10% 2em;
 }
 .htmleaf-header h2 {
        font-size:1.2em;
    }
    .htmleaf-links{font-size: 1.2em}
    .related h4{font-size: 1em;}
 .related a h4 {
  font-size: 0.8em;
 }
}

@media screen and (max-width: 766px) {
 .htmleaf-header h2 {
        font-size:1.3em;
    }
    .htmleaf-links{font-size: 1.3em}
}

@media screen and (max-width: 640px) {
 .htmleaf-header {
  padding: 2em 10% 2em;
 }
 .htmleaf-header h2 {
        font-size:1em;
    }
    .htmleaf-links{font-size: 1em}
    .related h4{font-size: 0.8em;}
 .related a h4 {
  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')
  }
1
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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.$message({
                 message: '用户名格式错误(6到16位，字母数字下划线，减号,中间不能有空格)',
                 type: 'warning'
                });
            }else{
                this.userKey = true;//用户名格式正确
            }
        },
        //密码验证
        inputPsdBlur(){
            let filter = /^(&#63;![0-9]+$)(&#63;![a-z]+$)(&#63;![A-Z]+$)(&#63;!([^(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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