<template> <div class="s-canvas">  <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas> </div></template><script>export default{ name: 'SIdentify', props: {  identifyCode: { // 默認注冊碼   type: String,   default: '1234'  },  fontSizeMin: { // 字體最小值   type: Number,   default: 25  },  fontSizeMax: { // 字體最大值   type: Number,   default: 35  },  backgroundColorMin: { // 驗證碼圖片背景色最小值   type: Number,   default: 200  },  backgroundColorMax: { // 驗證碼圖片背景色最大值   type: Number,   default: 220  },  dotColorMin: { // 背景干擾點最小值   type: Number,   default: 60  },  dotColorMax: { // 背景干擾點最大值   type: Number,   default: 120  },  contentWidth: { // 容器寬度   type: Number,   default: 90  },  contentHeight: { // 容器高度   type: Number,   default: 38  } }, methods: {  // 生成一個隨機數  randomNum (min, max) {   return Math.floor(Math.random() * (max - min) + min)  },   // 生成一個隨機的顏色  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'   // 繪制背景   ctx.fillStyle = '#e6ecfd'   ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)   // 繪制文字   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(50, 160) // 隨機生成字體顏色   ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei' // 隨機生成字體大小   let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))   let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)   var deg = this.randomNum(-30, 30)   // 修改坐標原點和旋轉角度   ctx.translate(x, y)   ctx.rotate(deg * Math.PI / 180)   ctx.fillText(txt, 0, 0)   // 恢復坐標原點和旋轉角度   ctx.rotate(-deg * Math.PI / 180)   ctx.translate(-x, -y)  },   drawLine (ctx) {   // 繪制干擾線   for (let i = 0; i < 4; i++) {    ctx.strokeStyle = this.randomColor(100, 200)    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) {   // 繪制干擾點   for (let i = 0; i < 30; 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>

<el-form-item prop="code">  <el-input type="text" v-model="formLogin.code" placeholder="- - - -">   <template slot="prepend">驗證碼</template>   <template slot="append">    <div class="login-code" @click="refreshCode">     <Identify :identifyCode="identifyCode"></Identify>    </div>   </template>  </el-input> </el-form-item>

<el-button-group>        <el-button style="width:100%" @click="submit" type="primary">登錄</el-button> </el-button-group>

import Identify from './identify'

// 表單   formLogin: {    username: "",    password: "",    code: ""   },   identifyCodes: '1234567890abcdefjhijklinopqrsduvwxyz',   identifyCode: '',   // 校驗   rules: {    username: [     { required: true, message: "請輸入用戶名", trigger: "blur" }    ],    password: [{ required: true, message: "請輸入密碼", trigger: "blur" }],    code: [{ required: true, message: "請輸入驗證碼", trigger: "blur" }]   }

mounted () {  // 初始化驗證碼  this.identifyCode = ''  this.makeCode(this.identifyCodes, 4) },

 // 引入驗證接口...mapActions("d2admin/account", ["login"]),    // 重置驗證碼  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)]   }  },  randomNum (min, max) {   return Math.floor(Math.random() * (max - min) + min)  },  /**  * @description 提交表單  */  // 提交登錄信息  submit() {    if (this.formLogin.code.toLowerCase() !== this.identifyCode.toLowerCase()) {    this.$message.error('請填寫正確驗證碼')    this.refreshCode()    return   }   this.$refs.loginForm.validate(valid => {    if (valid) {     // 登錄     // 注意 這里的演示沒有傳驗證碼     // 具體需要傳遞的數據請自行修改代碼     this.login({      vm: this,      username: this.formLogin.username,      password: this.formLogin.password     });    } else {     // 登錄表單校驗失敗     this.$message.error("表單校驗失敗");    }   });  }