vue实现随机验证码功能

效果图：

1.html代码

 <div class="form-group" style="display: flex;">
                     <div>
                         <span>验证码：</span>
                         <input type="text" id="code" v-model="code" class="code"  placeholder="请输入您的验证码" />
                     </div>
                   <div class="login-code" @click="refreshCode">
             <!--验证码组件-->
             <s-identify :identifyCode="identifyCode"></s-identify>
             </div>
                 </div>

HTML

2.css样式

 /*验证码样式*/
 .code{
     width:124px;
     height:31px;
     border:1px solid rgba(186,186,186,1);
 }
 .login-code{
      cursor: pointer;
 }

CSS 代码

3.js引入验证码组件,并且定义三个变量。

import SIdentify  from '../components/sidentify'

components: { SIdentify },
data () {
    return {
      identifyCodes: "1234567890",
      identifyCode: "",
      code:"",//text框输入的验证码
    }
}, 

引入验证码组件，以及需要定义的变量

4.mounted里的代码

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

mounted代码

5.在created里初始化验证码

6.methods里添加以下方法。

 //验证码
 randomNum(min, max) {
     return Math.floor(Math.random() * (max - min) + min);
 },

 refreshCode() {
     this.identifyCode = "";
     this.makeCode(this.identifyCodes, 4);
 },
 makeCode(o, l) {
     for (let i = 0; i < l; i++) {
         this.identifyCode += this.identifyCodes[
           this.randomNum(0, this.identifyCodes.length)
         ];
     }
     console.log(this.identifyCode);
 },

需要用到的方法

在提交表单的时候对验证码进行判断。

sidentify.vue组件代码：

代码：

 <template>
     <div class="s-canvas">
         <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
     </div>
 </template>
 <script>
 export default {
     name: 'SIdentify',
     props: {
         identifyCode: {
             type: String,
             default: '1234'
         },
         fontSizeMin: {
             type: Number,
             default: 25
         },
         fontSizeMax: {
             type: Number,
             default: 30
         },
         backgroundColorMin: {
             type: Number,
             default: 255
         },
         backgroundColorMax: {
             type: Number,
             default: 255
         },
         colorMin: {
             type: Number,
             default: 0
         },
         colorMax: {
             type: Number,
             default: 160
         },
         lineColorMin: {
             type: Number,
             default: 100
         },
         lineColorMax: {
             type: Number,
             default: 255
         },
         dotColorMin: {
             type: Number,
             default: 0
         },
         dotColorMax: {
             type: Number,
             default: 255
         },
         contentWidth: {
             type: Number,
             default: 112
         },
         contentHeight: {
             type: Number,
             default: 31
         }
     },
     methods: {
         // 生成一个随机数
         randomNum(min, max) {
             return Math.floor(Math.random() * (max - min) + min)
         },
         // 生成一个随机的颜色
         randomColor(min, max) {
             let r = this.randomNum(min, max)
             let g = this.randomNum(min, max)
             let b = this.randomNum(min, max)
             return 'rgb(' + r + ',' + g + ',' + b + ')'
         },
         drawPic() {
             let canvas = document.getElementById('s-canvas')
             let ctx = canvas.getContext('2d')
             ctx.textBaseline = 'bottom'
             // 绘制背景
             ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
             ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
             // 绘制文字
             for (let i = 0; i < this.identifyCode.length; i++) {
                 this.drawText(ctx, this.identifyCode[i], i)
             }
             this.drawLine(ctx)
             this.drawDot(ctx)
         },
         drawText(ctx, txt, i) {
             ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
             ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei'
             let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
             let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
             var deg = this.randomNum(-45, 45)
             // 修改坐标原点和旋转角度
             ctx.translate(x, y)
             ctx.rotate(deg * Math.PI / 180)
             ctx.fillText(txt, 0, 0)
             // 恢复坐标原点和旋转角度
             ctx.rotate(-deg * Math.PI / 180)
             ctx.translate(-x, -y)
         },
         drawLine(ctx) {
             // 绘制干扰线
             for (let i = 0; i < 5; i++) {
                 ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
                 ctx.beginPath()
                 ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
                 ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
                 ctx.stroke()
             }
         },
         drawDot(ctx) {
             // 绘制干扰点
             for (let i = 0; i < 80; i++) {
                 ctx.fillStyle = this.randomColor(0, 255)
                 ctx.beginPath()
                 ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
                 ctx.fill()
             }
         }
     },
     watch: {
         identifyCode() {
             this.drawPic()
         }
     },
     mounted() {
         this.drawPic()
     }
 }
 </script>
 <style scoped>
 .s-canvas {
     height: 38px;

 }
 .s-canvas canvas{
     margin-top: 1px;
     margin-left: 8px;
 }
 </style>

这篇文章是我参考别人写的，很感谢那个博主。

登录功能带验证码的例子：https://www.jianshu.com/p/99c6e2f3e457