vue实现随机验证码功能的实例代码

1.html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>

2.css样式

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

3.js引入验证码组件,并且定义三个变量。

import SIdentify from '../components/sidentify'

components: { SIdentify },
data () {
  return {
   identifyCodes: "1234567890",
   identifyCode: "",
   code:"",//text框输入的验证码
  }
}, 

4.mounted里的代码

mounted(){
   this.identifyCode = "";
   this.makeCode(this.identifyCodes, 4);
 },

5.在created里初始化验证码

6.methods里添加以下方法。

需要用到的方法

//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);
},

在提交表单的时候对验证码进行判断。

sidentify.vue组件代码：

<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'
    },
    fontSizeMin: {
      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.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 < 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>

总结

以上所述是小编给大家介绍的vue实现随机验证码功能的实例代码，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！