vue实现随机验证码功能(完整代码)

<div class="form-group" style="display: flex;">
   <div>
   <span>验证码：</span>
   <input type="text" id="code" v-model="code" class="code" placeholder="请输入您的验证码" />
   </div>
   <div class="login-code" @click="refreshcode">
  <!--验证码组件-->
  <s-identify :identifycode="identifycode"></s-identify>
  </div>
  </div>

/*验证码样式*/
.code{
 width:124px;
 height:31px;
 border:1px solid rgba(186,186,186,1);
}
.login-code{
 cursor: pointer;
}

import sidentify from '../components/sidentify'

components: { sidentify },
data () {
 return {
 identifycodes: "1234567890",
 identifycode: "",
 code:"",//text框输入的验证码
 }
}, 

mounted(){
 this.identifycode = "";
 this.makecode(this.identifycodes, 4);
},

//验证码
randomnum(min, max) {
 return math.floor(math.random() * (max - min) + min);
},
 
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);
},

<template>
 <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'
 },
 fontsi*: {
  type: number,
  default: 25
 },
 fontsizemax: {
  type: number,
  default: 30
 },
 backgroundcolormin: {
  type: number,
  default: 255
 },
 backgroundcolormax: {
  type: number,
  default: 255
 },
 colormin: {
  type: number,
  default: 0
 },
 colormax: {
  type: number,
  default: 160
 },
 linecolormin: {
  type: number,
  default: 100
 },
 linecolormax: {
  type: number,
  default: 255
 },
 dotcolormin: {
  type: number,
  default: 0
 },
 dotcolormax: {
  type: number,
  default: 255
 },
 contentwidth: {
  type: number,
  default: 112
 },
 contentheight: {
  type: number,
  default: 31
 }
 },
 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 = 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.fontsi*, 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 < 5; 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 < 80; 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 scoped>
.s-canvas {
 height: 38px;
 
}
.s-canvas canvas{
 margin-top: 1px;
 margin-left: 8px;
}
</style>