登录页面
思路：
1 整体上是使用了 canvas画布,绘制线段moveTo,lineTo,起点在 canvas宽度范围内随机 ,终点在 canvas高度范围的
2 干扰点arc而且圆心在 canvas宽高范围内随机
3 因为验证码是随机的,所以验证码由外部传入,组件内部监听这个属性的改变,以便重绘验证码fillText,translate位置随机,rotate旋转角度随机
4 既然封装组件了,做了更多的自定义操作,比如字体颜色,大小,验证码背景色,线的的颜色等等都可以作为属性传进来,也就是用户自定义配置,当然也都设置了默认值
5 颜色也都是随机色
逻辑分析：
通过identifyCode属性传参把随机生成的验证码传给验证码组件
1 identifyCodes定义了随机验证码能在哪些字符内产生
2 randomNum 生成 在随机验证码范围内的随机数
3 refreshCode 点击验证码重新在生成新的验证码
4 makeCode 生成新的验证码 位数可指定
实现代码
生成图片代码
<template>
<!-- 图形验证码 -->
<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: 35
},
fontSizeMax: {
type: Number,
default: 35
},
backgroundColorMin: {
type: Number,
default: 180
},
backgroundColorMax: {
type: Number,
default: 240
},
colorMin: {
type: Number,
default: 50
},
colorMax: {
type: Number,
default: 160
},
lineColorMin: {
type: Number,
default: 100
},
lineColorMax: {
type: Number,
default: 200
},
dotColorMin: {
type: Number,
default: 0
},
dotColorMax: {
type: Number,
default: 255
},
contentWidth: {
type: Number,
default: 160
},
contentHeight: {
type: Number,
default: 40
}
},
watch: {
identifyCode() {
this.drawPic()
}
},
mounted() {
this.drawPic()
},
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 + ')'
},
transparent() {
return 'rgb(255,255,255)'
},
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.fillStyle = this.transparent()
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)
}
// 绘制背景
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(-10, 10)
// 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()
}
}
}
}
</script>
登录页面引用代码
<template>
<el-form label-position="left" :rules="checkRules" ref="checkForm" :model="model" @submit.native.prevent="checkAuth">
<el-form-item prop="username">
<el-input
v-model="model.username"
placeholder="用户名"
clearable
></el-input>
</el-form-item>
<el-form-item prop="password">
<el-input
type="password"
v-model="model.password"
placeholder="密码"
clearable
></el-input>
</el-form-item>
<el-form-item prop="captcha">
<div class="vPicBox">
<el-input
v-model="model.captcha"
placeholder="请输入验证码"
style="width: 60%"
/>
<div class="vPic">
<div class="code" @click="refreshCode">
<s-identify :identify-code="identifyCode"></s-identify>
</div>
</div>
</div>
</el-form-item>
<el-form-item>
<el-button type="primary" size="large" style="width: 100%; margin-left: 0%" native-type="submit">登录</el-button>
</el-form-item>
</el-form>
</template>
<script>
import SIdentify from '@/views/SIdentify.vue'
export default {
components: {
SIdentify,
},
data() {
var validCode = (rule, value, callback) => {
if (this.identifyCode !=value) {
this.refreshCode()
callback(new Error("请输入正确的验证码"));
}else {
callback();
}
};
return {
model: {
username:'',
password:'',
captcha:''
},
identifyCode: "",// 验证码
identifyCodes: '1234567890',//验证码随机范围
checkRules:{
username:[
{ required: true, message: '请输入用户名', trigger: 'blur' }
],
password:[
{ required: true, message: '请输入密码', trigger: 'blur' }
],
captcha:[
{ required: true, message: '请输入验证码', trigger: 'blur' },
{required: true,validator: validCode, trigger: 'blur' },
]
}
};
},
mounted() {
//组件挂载完毕刷新验证码
this.refreshCode()
},
methods: {
// 验证码点击刷新方法
refreshCode() {
this.identifyCode = ''
// 4位验证码可以根据自己需要来定义验证码位数
this.makeCode(this.identifyCodes, 6)
},
// 随机数
randomNum(min, max) {
max = max + 1
return Math.floor(Math.random() * (max - min) + min)
},
// 随机生成验证码字符串
makeCode(data, len) {
for (let i = 0; i < len; i++) {
this.identifyCode += data[this.randomNum(0, data.length - 1)]
}
console.log("随机验证码:",this.identifyCode)
},
}
}
</script>
