登录界面

SIdentify

创建验证码组件，实现绘画出图片验证码

<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>

在登录界面引入验证码组件并注册

 import SIdentify from '@/components/common/SIdentify'
    components: { SIdentify },

登录的form

      <el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="0px" class="demo-ruleForm">
        <el-form-item prop="username">
          <el-input v-model="ruleForm.username" placeholder="账号">
            <i slot="prepend" class="el-icon-s-custom"/>
          </el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input type="password" placeholder="密码" v-model="ruleForm.password">
            <i slot="prepend" class="el-icon-lock"/>
          </el-input>
        </el-form-item>
        <el-form-item prop="code">
          <el-row :span="24">
            <el-col :span="12">
              <el-input v-model="ruleForm.code" auto-complete="off" placeholder="请输入验证码" size=""
                        @keyup.enter.native="submitForm('ruleForm')"></el-input>
            </el-col>
            <el-col :span="12">
              <div class="login-code" @click="refreshCode">
                <!--验证码组件-->
                <s-identify :identifyCode="identifyCode"></s-identify>
              </div>
            </el-col>
          </el-row>
        </el-form-item>
        <el-form-item>
          <div class="login-btn">
            <el-button type="primary" @click="submitForm()">登录</el-button>
          </div>
        </el-form-item>
        <p style="font-size:12px;line-height:30px;color:#eaeaea;">Tips : 请输入账号密码登陆</p>
      </el-form>

点击刷新验证码

   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)
        ]
      }
    }

ending