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Vue 实现登录界面验证码功能

2020-04-21 07:24 2835 查看

登录界面

SIdentify

创建验证码组件，实现绘画出图片验证码

<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>

在登录界面引入验证码组件并注册

import SIdentify from '@/components/common/SIdentify'
components: { SIdentify },

登录的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="账号">
<i slot="prepend" class="el-icon-s-custom"/>
</el-input>
</el-form-item>
<el-form-item prop="password">
<el-input type="password" placeholder="密码" 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="请输入验证码" size=""
@keyup.enter.native="submitForm('ruleForm')"></el-input>
</el-col>
<el-col :span="12">
<div class="login-code" @click="refreshCode">
<!--验证码组件-->
<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()">登录</el-button>
</div>
</el-form-item>
<p style="font-size:12px;line-height:30px;color:#eaeaea;">Tips : 请输入账号密码登陆</p>
</el-form>

点击刷新验证码

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)
]
}
}

总结

以上所述是小编给大家介绍的Vue 实现登录界面验证码功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！

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