vue随机验证码组件的封装实现

<template>
 <div style="display: flex;justify-content: start;align-items: center;border-radius: 4px">
 <canvas style="" :width="contentWidth" :height="contentHeight" id="cav" @click="next()"></canvas>
 </div>
</template>

<script>
// import num from './components/cc'
export default {
 name: 'verificationCode',
 props: {
 fontSize: {
 type: Number,
 default: 20
 },
 contentWidth: {
 type: Number,
 default: 100
 },
 contentHeight: {
 type: Number,
 default: 40
 },
 verification: {
 type: String
 },
 refreshCode: {
 type: Boolean
 }
 },
 watch: {
 verification: function (newVal) {
 if (newVal.toLowerCase() === this.identify.toLowerCase()) {
 this.$emit('handleIdentify', true)
 } else {
 this.$emit('handleIdentify', false)
 }
 },
 refreshCode: function (newVal) {
 this.draw()
 }
 },
 mounted () {
 this.draw()
 },
 data () {
 return {
 identify: '',
 letter: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
 }
 },
 methods: {
 draw () {
 let self = this
 let text = this.randomNum()
 this.identify = text.join('')
 let ctx = document.getElementById('cav')
 let cav = ctx.getContext('2d')
 cav.clearRect(0, 0, self.contentWidth, self.contentHeight)
 let w = ctx.width
 let h = ctx.height
 cav.textBaseline = 'bottom'
 self.drawText(cav, text[0], 10, 10, self.randomDeg(0, 0.1), 20)
 self.drawText(cav, text[1], 20, 10, self.randomDeg(0, 0.1))
 self.drawText(cav, text[2], 25, 10, self.randomDeg(0, 0.1))
 self.drawText(cav, text[3], 30, 10, self.randomDeg(0, 0.1))
 let i
 for (i = 0; i < 3; i++) {
 self.drawLine(cav, self.randomDeg(0, 0.3 * w, 1), self.randomDeg(0, h, 1), self.randomDeg(0, w, 1), self.randomDeg(0, h, 1), self.randomDeg(0.8 * w, w, 1), self.randomDeg(0, h, 1))
 }
 },
 drawText (cav, text, x1, y1, route) {
 cav.beginPath()
 cav.fillStyle = '#ffe9db'
 cav.font = this.fontSize + 'px' + ' ' + '黑体'
 cav.translate(x1, y1)
 cav.rotate(Math.PI * route)
 cav.fillText(text, x1, y1)
 cav.fill()
 cav.rotate(-Math.PI * route)
 cav.translate(-(x1), -(y1))
 },
 drawLine (cav, x1, y1, x2, y2, x3, y3) {
 cav.beginPath()
 cav.strokeStyle = 'rgb(155, 204, 237)'
 cav.bezierCurveTo(x1, y1, x2, y2, x3, y3)
 cav.stroke()
 },
 randomNum () { // 生成随机字
 let i
 let letter = this.letter
 let text = []
 for (i = 0; i < 4; i++) {
 text.push(letter[Math.floor(Math.random() * 36)])
 }
 return text
 },
 randomDeg (min, max, f) { // 设置文字倾斜角度
 f = undefined "text-align: center">

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