先给大家展示下效果图：
1.html代码
<div> <div> <span>验证码：</span> <input type="text" v-model="code" placeholder="请输入您的验证码" /> </div> <div @click="refreshCode"> <!--验证码组件--> <s-identify :identifyCode="identifyCode"></s-identify> </div> </div>
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; }
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 } },
4.mounted里的代码
mounted(){ this.identifyCode = ""; this.makeCode(this.identifyCodes, 4); },
5.在created里初始化验证码
6.methods里添加以下方法。
需要用到的方法
//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); },
在提交表单的时候对验证码进行判断。
sidentify.vue组件代码：
<template> <div> <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>
总结