Vue如何实现验证码登录

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效果展示

第一步：创建验证码组件

这里是组件的代码，可以自行命名文件名，我这里命名为SIdentify.vue

<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>

第二步：引入验证码组件并注册使用

这里data里面的identifyCode的值就是所生成的验证码的值，可以通过该码自行发挥逻辑操作，SIdentify组件其实只是为了显示验证码图片而已，所以不用该组件还可以做成伪手机验证码登录

<template>  <div>    <SIdentify:identifyCode="identifyCode" >    </SIdentify>  </div></template>// 引入登录验证组件import SIdentify from "@/components/SIdentify";<script>    export default {        name: "SIdentify",        components: { SIdentify },        data(){            return {                identifyCode: "", //密码登录图形验证码                identifyCodes: "1234567890abcdefghizklmnopqrstuvwxyz", //生成图形验证码的依据            }        },        methods:{            // 刷新验证码            refreshIdentifyCode() {                this.identifyCode = "";                this.makeIdentifyCode(4);            },            // 生成4位数的随机验证码            makeIdentifyCode(l) {                for (let i = 0; i < l; i++) {                    this.identifyCode +=                    this.identifyCodes[this.randomNum(0, this.identifyCodes.length)];                }            },            // 生成单个验证码            randomNum(min, max) {                return Math.floor(Math.random() * (max - min) + min);            },        },        mounted() {            // 初始化验证码            this.identifyCode = "";            this.makeIdentifyCode(4);        },    }</script>

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