vue项目 - 基于canvas的图形验证码
2019-02-20 本文已影响2人
w_wx_x
效果图.png
<template>
<el-form class="login-form" status-icon :rules="loginRules" ref="loginForm" :model="loginForm" label-width="80px">
<el-form-item prop="username" label="用户：">
<el-input v-model="loginForm.username" auto-complete="off" placeholder="请输入用户名" size="medium" @keyup.enter.native="submitForm('loginForm')"></el-input>
</el-form-item>
<el-form-item prop="password" label="密码：">
<el-input :type="passwordType" v-model="loginForm.password" auto-complete="off" placeholder="请输入密码" size="medium">
<i class="el-icon-view el-input__icon" slot="suffix" @click="showPassword"></i>
</el-input>
</el-form-item>
<el-form-item prop="code">
<el-row :span="24">
<el-col :span="12">
<el-input v-model="loginForm.code" auto-complete="off" placeholder="请输入验证码" size="" @keyup.enter.native="submitForm('loginForm')"></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>
<el-button type="primary" @click="submitForm('loginForm')" class="login-submit">登录</el-button>
</el-form-item>
</el-form>
</template>
<script>
import { isLoginName } from '@/util/validate'
import SIdentify from './sidentify'
export default {
name: 'userLogin',
components: { SIdentify },
data() {
const validateCode = (rule, value, callback) => {
if (this.identifyCode !== value) {
this.loginForm.code = ''
this.refreshCode()
callback(new Error('请输入正确的验证码'))
} else {
callback()
}
}
return {
isDebugLogin: false,
loginForm: {
username: '',
password: '',
code: ''
},
identifyCodes: '1234567890',
identifyCode: '',
loginRules: {
username: [
{ required: true, trigger: 'blur', message: '请输入用户名' },
{ min: 1, max: 200, message: '长度在1-200字符之间', trigger: 'blur' },
{ validator: isLoginName, trigger: 'blur' }
],
password: [
{ required: true, message: '请输入密码', trigger: 'blur' },
{ min: 1, max: 100, message: '长度在1-100字符之间', trigger: 'blur' }
],
code: [
{ required: true, message: '请输入验证码', trigger: 'blur' },
{ validator: validateCode, trigger: 'blur' }
]
},
passwordType: 'password'
}
},
watch: {
isDebugLogin(v) {
if (v) {
this.loginForm.password = '123'
this.refreshCode()
}
},
identifyCode(v) {
this.isDebugLogin && (this.loginForm.code = v)
}
},
methods: {
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)
]
}
},
showPassword() {
this.passwordType === ''
? (this.passwordType = 'password')
: (this.passwordType = '')
},
submitForm(formName) {
this.$refs[formName].validate(valid => {
if (valid) {
console.log('授权成功')
} else {
return false
}
})
}
},
created() {
this.refreshCode()
}
}
</script>
<style>
.login-form .el-input__inner {
height: 40px;
line-height: 40px;
}
.login-form .el-form-item__label {
line-height: 40px;
}
.login-submit.el-button {
padding: 12px 20px;
}
</style>
<style lang="scss" scoped>
.login-form {
padding: 10px 0;
.el-form-item + .el-form-item {
margin-top: 30px;
}
.login-code {
cursor: pointer;
.login-code-img {
width: 100px;
height: 38px;
background-color: #eee;
border: 1px solid #f0f0f0;
color: #333;
font-size: 18px;
font-weight: bold;
letter-spacing: 2px;
text-indent: 2px;
text-align: center;
}
}
.login-submit {
width: 100%;
border: 0;
}
}
</style>
验证码组件SIdentify
<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: 16
},
fontSizeMax: {
type: Number,
default: 40
},
backgroundColorMin: {
type: Number,
default: 180
},
backgroundColorMax: {
type: Number,
default: 240
},
colorMin: {
type: Number,
default: 50
},
colorMax: {
type: Number,
default: 160
},
lineColorMin: {
type: Number,
default: 40
},
lineColorMax: {
type: Number,
default: 180
},
dotColorMin: {
type: Number,
default: 0
},
dotColorMax: {
type: Number,
default: 255
},
contentWidth: {
type: Number,
default: 112
},
contentHeight: {
type: Number,
default: 38
}
},
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 < 8; 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 < 100; 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 lang="scss" scoped>
.s-canvas {
height: 38px;
canvas {
margin-top: 1px;
margin-left: 8px;
}
}
</style>
