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使用Vue怎么在登錄界面實現驗證碼功能?很多新手對此不是很清楚,為了幫助大家解決這個難題,下面小編將為大家詳細講解,有這方面需求的人可以來學習下,希望你能有所收獲。
SIdentify
創建驗證碼組件,實現繪畫出圖片驗證碼
<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 = this.randomColor(this.backgroundColorMin, this.backgroundColorMax) 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(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 < 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) { // 繪制干擾點 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>
在登錄界面引入驗證碼組件并注冊
import SIdentify from '@/components/common/SIdentify' components: { SIdentify },
登錄的form
<el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="0px" class="demo-ruleForm"> <el-form-item prop="username"> <el-input v-model="ruleForm.username" placeholder="賬號"> <i slot="prepend" class="el-icon-s-custom"/> </el-input> </el-form-item> <el-form-item prop="password"> <el-input type="password" placeholder="密碼" v-model="ruleForm.password"> <i slot="prepend" class="el-icon-lock"/> </el-input> </el-form-item> <el-form-item prop="code"> <el-row :span="24"> <el-col :span="12"> <el-input v-model="ruleForm.code" auto-complete="off" placeholder="請輸入驗證碼" size="" @keyup.enter.native="submitForm('ruleForm')"></el-input> </el-col> <el-col :span="12"> <div class="login-code" @click="refreshCode"> <!--驗證碼組件--> <s-identify :identifyCode="identifyCode"></s-identify> </div> </el-col> </el-row> </el-form-item> <el-form-item> <div class="login-btn"> <el-button type="primary" @click="submitForm()">登錄</el-button> </div> </el-form-item> <p >Tips : 請輸入賬號密碼登陸</p> </el-form>
點擊刷新驗證碼
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) ] } }
Vue是一款友好的、多用途且高性能的JavaScript框架,使用vue可以創建可維護性和可測試性更強的代碼庫,Vue允許可以將一個網頁分割成可復用的組件,每個組件都包含屬于自己的HTML、CSS、JavaScript,以用來渲染網頁中相應的地方,所以越來越多的前端開發者使用vue。
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