Vue登录界面实现验证码组件

验证码组件

<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: 120
      },
      contentHeight: {
        type: Number,
        default: 48
      }
    },
    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 < 8; 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 < 100; 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 lang="scss" scoped>
  .s-canvas {
    height: 38px;
    canvas {
      margin-top: 1px;
      margin-left: 8px;
    }
  }
</style>

登录界面引用组件

<template>
 <s-identify :identifyCode="identifyCode"></s-identify>
</template>
<script>
    // 这里是你存放组件的位置
    import SIdentify from '@/xxxx/SIdentify'
</script>
export default {
    // 登录框完成校验dui'c
    const validateCode = (rule, value, callback) => {
      if (this.identifyCode !== value) {
        this.loginForm.code = ''
        this.refreshCode()
        callback(new Error('请输入正确的验证码'))
      } else {
        callback()
      }
    },
    name: 'Login',
    components: {SIdentify},
    data() {
        return: {
            loginRules: {
                  username: [{required: true, trigger: 'blur', validator: validateUsername}],
                  password: [{required: true, trigger: 'blur', validator: validatePassword}],
                  code: [
                    {required: true, trigger: 'blur', validator: validateCode}
                  ]
            },
            // 这是验证码生成范围，如果想要大小写英文，可以继续添加
            identifyCodes: '1234567890',
            // 
            identifyCode: ''
        }
    },
    methods: {
      //验证码生成方法
      randomNum(min, max) {
        return Math.floor(Math.random() * (max - min) + min);
      },
       // 页面点击后刷新验证码
      refreshCode() {
        this.identifyCode = "";
        this.makeCode(this.identifyCodes, 4);
      },
      // 生成验证码
      makeCode(o, l) {
        for (let i = 0; i < l; i++) {
          this.identifyCode += this.identifyCodes[
            this.randomNum(0, this.identifyCodes.length)
            ];
        }
      },
    }
}