效果如图
验证码
image.png
1.首先新建一个Identify组件，我将它新建在了components文件夹下，写入以下内容,样式用了stylus预处理器，如果未安装请先安装，你也可以选择不使用stylus
npm install stylus --save
npm install stylus-loader --save
<template>
<div class="s-canvas">
<canvas class="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
<span @click="changeCode" class="s-canvas-tip">换一张</span>
</div>
</template>
<script>
export default{
name: 'Identify',
props: {
identifyCode: {
type: String,
default: '1234'
},
fontSizeMin: {
type: Number,
default: 20
},
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: 40
},
lineColorMax: {
type: Number,
default: 180
},
dotColorMin: {
type: Number,
default: 0
},
dotColorMax: {
type: Number,
default: 255
},
contentWidth: {
type: Number,
default: 100
},
contentHeight: {
type: Number,
default: 40
},
changeCode:{
type:Function
}
},
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.getElementsByClassName('s-canvas');
let ctx = canvas[1].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)
if(canvas[3]){
let ctx1 = canvas[3].getContext('2d');
ctx1.textBaseline = 'bottom'
// 绘制背景
ctx1.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
ctx1.fillRect(0, 0, this.contentWidth, this.contentHeight)
// 绘制文字
for (let i = 0; i < this.identifyCode.length; i++) {
this.drawText(ctx1, this.identifyCode[i], i)
}
this.drawLine(ctx1)
this.drawDot(ctx1)
}
if(canvas[5]){
let ctx2 = canvas[5].getContext('2d');
ctx2.textBaseline = 'bottom'
// 绘制背景
ctx2.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
ctx2.fillRect(0, 0, this.contentWidth, this.contentHeight)
// 绘制文字
for (let i = 0; i < this.identifyCode.length; i++) {
this.drawText(ctx2, this.identifyCode[i], i)
}
this.drawLine(ctx2)
this.drawDot(ctx2)
}
},
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 < 3; 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 < 30; 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="stylus" scoped>
.s-canvas{
margin-left 10px
display flex
align-items center
.s-canvas-tip{
color #5C7099
font-size 14px
margin-left 10px
cursor pointer
}
}
</style>
在你需要的页面进行引入使用
<template>
<div class="change-email">
<Identify :identifyCode="identifyCode" :changeCode="changeCode"></Identify>
</div>
</template>
<script>
import Identify from "../../components/Identify";
export default {
name: "changeEmail",
data(){
return{
identifyCode:'1234', //验证码的值
identifyCodes:'1234567890' //验证码的生成范围
}
},
components:{
Identify
},
//刚进来就初始化下值，不然刚进来一直是默认值1234
mounted(){
this.changeCode();
},
methods:{
// 点击验证码刷新验证码
changeCode () {
this.identifyCode = ''
this.makeCode(this.identifyCodes, 4)
},
// 生成一个随机整数 randomNum(0, 10) 0 到 10 的随机整数， 包含 0 和 10
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)]
}
}
}
}
</script>
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