vue 验证码
一、概述
效果图
二、代码实现
新建test目录,放2个vue文件。
sidentify.vue组件代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<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>
说明
test.vue
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<template> <div class="form-group" style="display: flex;"> <div> <span>验证码:</span> <input type="text" id="code" v-model="code" class="code" placeholder="请输入验证码"/> </div> <div class="login-code" @click="refreshCode"> <!--验证码组件--> <s-identify :identifyCode="identifyCode"></s-identify> </div> <div> <button @click="checkCaptcha">验证</button> </div> </div> </template> <script> import SIdentify from '../login/sidentify' export default { components: { SIdentify }, data() { return { identifyCodes: '1234567890', identifyCode: '', code: '',//text框输入的验证码 tableData: [] } }, mounted: function() { this.identifyCode = '' // 初始化验证码 this.makeCode(this.identifyCodes, 4) }, methods: { //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("验证码",this.identifyCode) }, // 检查验证码是否正确 checkCaptcha(){ if (this.code == ""){ alert("请输入验证码") return false } if (this.identifyCode != this.code){ this.code = '' this.refreshCode() alert("请输入正确的验证码") return false } console.log("验证码正确") } } } </script> <style> /*验证码样式*/ .code { width: 124px; height: 31px; border: 1px solid rgba(186, 186, 186, 1); } .login-code { cursor: pointer; } </style>
访问页面,输入正确的验证码,会有提示。
注意:我在console中,输出了正确的验证码,照着填写即可。
这个样式,可能不太美观。如果需要用到项目中,可以自行调整样式。
本文参考链接: