vue實現隨機驗證碼功能

效果圖：

1.html代碼

 1 <div class="form-group" style="display: flex;">
 2                     <div>
 3                         <span>驗證碼：</span>
 4                         <input type="text" id="code" v-model="code" class="code"  placeholder="請輸入您的驗證碼" />
 5                     </div>
 6                   <div class="login-code" @click="refreshCode">
 7             <!--驗證碼組件-->
 8             <s-identify :identifyCode="identifyCode"></s-identify>
 9             </div>
10                 </div>

2.css樣式

1 /*驗證碼樣式*/
2 .code{
3     width:124px;
4     height:31px;
5     border:1px solid rgba(186,186,186,1);
6 }
7 .login-code{
8      cursor: pointer;
9 }

3.js引入驗證碼組件,並且定義三個變數。

import SIdentify  from '../components/sidentify'

components: { SIdentify },
data () {
    return {
      identifyCodes: "1234567890",
      identifyCode: "",
      code:"",//text框輸入的驗證碼
    }
}, 

4.mounted里的代碼

1 mounted(){
2     this.identifyCode = "";
3     this.makeCode(this.identifyCodes, 4);
4 },

5.在created里初始化驗證碼

6.methods里添加以下方法。

 1 //驗證碼
 2 randomNum(min, max) {
 3     return Math.floor(Math.random() * (max - min) + min);
 4 },
 5       
 6 refreshCode() {
 7     this.identifyCode = "";
 8     this.makeCode(this.identifyCodes, 4);
 9 },
10 makeCode(o, l) {
11     for (let i = 0; i < l; i++) {
12         this.identifyCode += this.identifyCodes[
13           this.randomNum(0, this.identifyCodes.length)
14         ];
15     }
16     console.log(this.identifyCode);
17 },

在提交表單的時候對驗證碼進行判斷。

sidentify.vue組件代碼：

代碼：

  1 <template>
  2     <div class="s-canvas">
  3         <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
  4     </div>
  5 </template>
  6 <script>
  7 export default {
  8     name: 'SIdentify',
  9     props: {
 10         identifyCode: {
 11             type: String,
 12             default: '1234'
 13         },
 14         fontSizeMin: {
 15             type: Number,
 16             default: 25
 17         },
 18         fontSizeMax: {
 19             type: Number,
 20             default: 30
 21         },
 22         backgroundColorMin: {
 23             type: Number,
 24             default: 255
 25         },
 26         backgroundColorMax: {
 27             type: Number,
 28             default: 255
 29         },
 30         colorMin: {
 31             type: Number,
 32             default: 0
 33         },
 34         colorMax: {
 35             type: Number,
 36             default: 160
 37         },
 38         lineColorMin: {
 39             type: Number,
 40             default: 100
 41         },
 42         lineColorMax: {
 43             type: Number,
 44             default: 255
 45         },
 46         dotColorMin: {
 47             type: Number,
 48             default: 0
 49         },
 50         dotColorMax: {
 51             type: Number,
 52             default: 255
 53         },
 54         contentWidth: {
 55             type: Number,
 56             default: 112
 57         },
 58         contentHeight: {
 59             type: Number,
 60             default: 31
 61         }
 62     },
 63     methods: {
 64         // 生成一個隨機數
 65         randomNum(min, max) {
 66             return Math.floor(Math.random() * (max - min) + min)
 67         },
 68         // 生成一個隨機的顏色
 69         randomColor(min, max) {
 70             let r = this.randomNum(min, max)
 71             let g = this.randomNum(min, max)
 72             let b = this.randomNum(min, max)
 73             return 'rgb(' + r + ',' + g + ',' + b + ')'
 74         },
 75         drawPic() {
 76             let canvas = document.getElementById('s-canvas')
 77             let ctx = canvas.getContext('2d')
 78             ctx.textBaseline = 'bottom'
 79             // 繪製背景
 80             ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
 81             ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
 82             // 繪製文字
 83             for (let i = 0; i < this.identifyCode.length; i++) {
 84                 this.drawText(ctx, this.identifyCode[i], i)
 85             }
 86             this.drawLine(ctx)
 87             this.drawDot(ctx)
 88         },
 89         drawText(ctx, txt, i) {
 90             ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
 91             ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei'
 92             let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
 93             let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
 94             var deg = this.randomNum(-45, 45)
 95             // 修改坐標原點和旋轉角度
 96             ctx.translate(x, y)
 97             ctx.rotate(deg * Math.PI / 180)
 98             ctx.fillText(txt, 0, 0)
 99             // 恢復坐標原點和旋轉角度
100             ctx.rotate(-deg * Math.PI / 180)
101             ctx.translate(-x, -y)
102         },
103         drawLine(ctx) {
104             // 繪製干擾線
105             for (let i = 0; i < 5; i++) {
106                 ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
107                 ctx.beginPath()
108                 ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
109                 ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
110                 ctx.stroke()
111             }
112         },
113         drawDot(ctx) {
114             // 繪製干擾點
115             for (let i = 0; i < 80; i++) {
116                 ctx.fillStyle = this.randomColor(0, 255)
117                 ctx.beginPath()
118                 ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
119                 ctx.fill()
120             }
121         }
122     },
123     watch: {
124         identifyCode() {
125             this.drawPic()
126         }
127     },
128     mounted() {
129         this.drawPic()
130     }
131 }
132 </script>
133 <style scoped>
134 .s-canvas {
135     height: 38px;
136    
137 }
138 .s-canvas canvas{
139     margin-top: 1px;
140     margin-left: 8px;
141 }
142 </style>

這篇文章是我參考別人寫的，很感謝那個博主。

 登錄功能帶驗證碼的例子：https://www.jianshu.com/p/99c6e2f3e457