Vue 实现登录界面验证码功能
程序员文章站
2022-03-20 18:24:10
登录界面
sidentify
创建验证码组件，实现绘画出图片验证码
...
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'
},
fontsi*: {
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.fontsi*, 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
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