1.新建identify.vue文件


内容：

<template><div class="s-canvas"><canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas></div>
</template>
<script>export default{name: 'SIdentify',props: {identifyCode: { //默认注册码type: String,default: '1234'},fontSizeMin: { // 字体最小值type: Number,default: 25},fontSizeMax: { // 字体最大值type: Number,default: 35},backgroundColorMin: { // 验证码图片背景色最小值type: Number,default: 200},backgroundColorMax: {  // 验证码图片背景色最大值type: Number,default: 220},dotColorMin: { // 背景干扰点最小值type: Number,default: 60},dotColorMax: { // 背景干扰点最大值type: Number,default: 120},contentWidth: { //容器宽度type: Number,default: 85},contentHeight: { //容器高度type: Number,default: 32}},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(50, 160) //随机生成字体颜色ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei' //随机生成字体大小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 < 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) {// 绘制干扰点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>

2.使用<el-form-item label="图形验证码" prop="picCode"><el-input type="input" v-model="ruleForm.picCode" autocomplete="off" class="telCode w55" placeholder="请输入图形验证码"></el-input><div class="w40 fr"><div class="code fl" style="height: 40px;" @click="refreshCode"><s-identify :identifyCode="identifyCode"></s-identify></div>// <span class="fr prompt" @click="refreshCode">换一张</span></div>
</el-form-item>

import SIdentify from '../../../components/page/identify' components:{SIdentify},
data(){var validatePicCode = (rule, value, callback) => {if (value !== this.identifyCode) {callback(new Error('请输入正确的验证码'));//当错误时刷新验证码this.identifyCode = '';this.makeCode(this.identifyCodes, 4);} else {callback()} }return{identifyCodes: "1234567890",//验证码identifyCode: "1246",ruleForm: {picCode:''},rules: {picCode: [{ validator: validatePicCode, trigger: 'blur' }],}
},
methods: {//验证码startrandomNum(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)];}},//end
}