vue实现登录拦截

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>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
<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>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
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;
 }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253

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
      },
  },
1
2
3
4
5
6
7
8
2、登录页面路由

{
    path: '/login',
    name: 'login',
    component: () => import(/* webpackChunkName: "about" */ '../views/Login.vue')
  }
1
2
3
4
5
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();
  }
})
1
2
3
4
5
6
7
8
9
10
11
12
13
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>