新建vue–identify文件，粘入以下代码 作为一个组件使用
<template>
<div class="s-canvas">
<canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
</div>
</template>
<script>
export default {
name: 'SIdentify',
props: {
identifyCode: {
// 默认注册码
type: String,
default: '1234'
},
fontSizeMin: {
// 字体最小值
type: Number,
default: 25
},
fontSizeMax: {
// 字体最大值
type: Number,
default: 35
},
backgroundColorMin: {
// 验证码图片背景色最小值
type: Number,
default: 200
},
backgroundColorMax: {
// 验证码图片背景色最大值
type: Number,
default: 220
},
dotColorMin: {
// 背景干扰点最小值
type: Number,
default: 60
},
dotColorMax: {
// 背景干扰点最大值
type: Number,
default: 120
},
contentWidth: {
// 容器宽度
type: Number,
default: 90
},
contentHeight: {
// 容器高度
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 = '#e6ecfd'
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(50, 160) // 随机生成字体颜色
ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei' // 随机生成字体大小
let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
var deg = this.randomNum(-30, 30)
// 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 < 4; i++) {
ctx.strokeStyle = this.randomColor(100, 200)
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>
在需要验证码的页面引入组件
import Identify from './identify'
components: {
SIdentify }, //写在export default{
}中与data同级表示使用组件
登录页完整代码
<template>
<div>
<input type="text" v-model="code" placeholder="请输入" />
<div class="div3" @click="refreshCode">
<Identify :identifyCode="identifyCode"></Identify>
</div>
</div>
</template>
<script>
import Identify from './identify'
export default {
components: {
Identify
}, //写在export default{
}中与data同级表示使用组件
data: function() {
return {
code: "",
// 验证码
identifyCodes: '1234567890abcdefjhijklinopqrsduvwxyz', //随机串内容
identifyCode: '', //这是生成的验证码的值
};
},
mounted() {
this.identifyCode = ''
this.makeCode(this.identifyCodes, 4)
console.log(this.identifyCode, '这是生成的验证码的值')
},
methods: {
// 重置验证码
refreshCode() {
this.identifyCode = '';
this.makeCode(this.identifyCodes, 4);
console.log(this.identifyCode, '这是生成的验证码的值')
},
makeCode(o, l) {
for (let i = 0; i < l; i++) {
this.identifyCode += this.identifyCodes[this.randomNum(0, this.identifyCodes.length)]
}
},
randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min)
},
}
}
</script>
<style scoped>
.captcha-image {
display: flex;
justify-content: center;
align-items: center;
margin-top: 50px;
}
.refresh {
margin-top: 50px;
}
</style>