第一步先创建一个canvasTest.vue，封装验证码的组件
<template>
<div class="s-canvas">
<canvas id="s-canvas" :width="contentWidth" :height="contentHeight" />
</div>
</template>
<script>
export default {
name: 'SIdentify',
props: {
identifyCode: {
type: String,
default: '1234'
},
fontSizeMin: {
type: Number,
default: 30
},
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: 50
}
},
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) {
const r = this.randomNum(min, max)
const g = this.randomNum(min, max)
const b = this.randomNum(min, max)
return 'rgb(' + r + ',' + g + ',' + b + ')'
},
drawPic() {
const canvas = document.getElementById('s-canvas')
const 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'
const x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
const 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)
// 设置文字的旋转角度
ctx.rotate(deg * Math.PI / 45)
ctx.fillText(txt, 0, 0)
// 恢复坐标原点和旋转角度
ctx.rotate(-deg * Math.PI / 45)
ctx.translate(-x, -y)
},
drawLine(ctx) {
// 绘制干扰线
for (let i = 0; i < 4; 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()
}
}
}
}
</script>
在登录页页面中使用
data() {
/* 自定义验证码规则 */
const validateVerifycode = (rule, value, callback) => {
if (value === '') {
callback(new Error('请输入验证码'))
} else if (value !== this.identifyCode) {
callback(new Error('验证码不正确!'))
} else {
callback()
}
}
return {
identifyCodes: '1234567890abcdefghijklmnopqrstuvwxyz',
identifyCode: '',
rules: {
verifycode: [{
required: true,
trigger: 'blur',
validator: validateVerifycode,}]
}
}
},
components:{
SIdentify
},
mounted(){
this.identifyCode='';
this.makeCode(this.identifyCodes,4);
history.pushState(null, null, document.URL);
if (window.history && window.history.pushState) {
window.addEventListener('popstate', function() {
window.history.pushState('forward', null, '')
window.history.forward(1)
})
window.history.pushState('forward', null, '') // 在IE中必须得有这两行
window.history.forward(1)
}
},
methods: {
randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min)
},
// 切换验证码
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)]
}
console.log(this.identifyCode)
/* alert(this.identifyCode) */
}
}
最后的显示成果：
