效果展示
安装插件
npm i identify
定义组件 verificationCode.vue
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<template> <!-- 图形验证码 --> <div class="s-canvas"> <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas> </div> </template> <script> export default { name: "verificationCode", props: { identifyCode: { type: String, default: "1234" }, fontSizeMin: { type: Number, default: 35 }, fontSizeMax: { type: Number, default: 35 }, backgroundColorMin: { type: Number, default: 180 }, backgroundColorMax: { type: Number, default: 240 }, colorMin: { type: Number, default: 50 }, colorMax: { type: Number, default: 160 }, lineColorMin: { type: Number, default: 100 }, lineColorMax: { type: Number, default: 200 }, dotColorMin: { type: Number, default: 0 }, dotColorMax: { type: Number, default: 255 }, contentWidth: { type: Number, default: 120 }, contentHeight: { type: Number, default: 50 } }, 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 + ")"; }, transparent() { return "rgb(255,255,255)"; }, 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.fillStyle = this.transparent(); 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); } // 绘制背景 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(-10, 10); // 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 < 8; 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 < 100; 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>
页面引用
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<li class="inp_code"> <div class="sel-code"> <input type="text" placeholder="请输入验证码"> <div class="get-code" @click="refreshCode()"> <verificationCode:identifyCode="identifyCode"></verificationCode> </div> </div> </li>
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
import SIdentify from '../../components/verificationCode' components:{ verificationCode }, data() { return { identifyCode: "", identifyCodes: "0123456789abcdwerwshdjeJKDHRJHKOOPLMKQ" } }, methods: { refreshCode() { this.identifyCode = ""; this.makeCode(this.identifyCodes,4); }, randomNum (min, max) { max = max + 1 return Math.floor(Math.random() * (max - min) + min) }, // 随机生成验证码字符串 makeCode (data, len) { for (let i = 0; i < len; i++) { this.identifyCode += data[this.randomNum(0, data.length - 1)] } } }, mounted() { this.refreshCode()//页面加载时就生成随机图形验证码 }