vue前端生成简易验证码

identify 生成验证码图片

<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: 28
    },
    fontSizeMax: {
      type: Number,
      default: 40
    },
    backgroundColorMin: {
      type: Number,
      default: 180
    },
    backgroundColorMax: {
      type: Number,
      default: 240
    },
    colorMin: {
      type: Number,
      default: 50
    },
    colorMax: {
      type: Number,
      default: 160
    },
    lineColorMin: {
      type: Number,
      default: 40
    },
    lineColorMax: {
      type: Number,
      default: 180
    },
    dotColorMin: {
      type: Number,
      default: 0
    },
    dotColorMax: {
      type: Number,
      default: 255
    },
    contentWidth: {
      type: Number,
      default: 112
    },
    contentHeight: {
      type: Number,
      default: 40
    }
  },
  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) {
      var r = this.randomNum(min, max)
      var g = this.randomNum(min, max)
      var b = this.randomNum(min, max)
      return 'rgb(' + r + ',' + g + ',' + b + ')'
    },
    drawPic () {
      var canvas = document.getElementById('s-canvas')
      var 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'
      var x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
      var y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
      var deg = this.randomNum(-30, 30)
      // 修改坐标原点和旋转角度
      ctx.translate(x, y)
      ctx.rotate(deg * Math.PI / 270)
      ctx.fillText(txt, 0, 0)
      // 恢复坐标原点和旋转角度
      ctx.rotate(-deg * Math.PI / 270)
      ctx.translate(-x, -y)
    },
    drawLine (ctx) {
      // 绘制干扰线
      for (let i = 0; i < 2; 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 < 20; 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>

引入到登录校验表单

<el-dialog title="提示" :visible.sync="dialogVisible" width="30%" :before-close="handleClose">
      <el-form :model="loginForm" ref="loginForm" status-icon :rules="loginRules" label-width="80px" label-position="left">
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            placeholder="请输入用户名"
            @keyup.enter.native="handleLogin"
            auto-complete="off"
          >
            <i slot="prefix" class="el-input__icon el-icon-s-custom"
							 style="font-size: 20px"></i>
          </el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            placeholder="请输入密码"
            @keyup.enter.native="handleLogin"
            :type="passwordType"
            v-model="loginForm.password"
            auto-complete="off"
          >
            <i class="el-input__icon el-icon-view"
               :style="fontstyle"
               slot="suffix"
               style="font-size: 20px"
               @click="showPassword">
            </i>
            <i slot="prefix"
               style="font-size: 20px"
               class="el-input__icon el-icon-lock"></i>
          </el-input>
        </el-form-item>
        <el-form-item prop="verifycode">
          <!-- 注意：prop与input绑定的值一定要一致，否则验证规则中的value会报undefined，因为value即为绑定的input输入值 -->
          <el-input v-model="loginForm.verifycode"
                    placeholder="请输入验证码"
                    class="identifyinput">
            <i slot="prefix"
							 class="el-input__icon el-icon-s-check"
							 style="font-size: 22px"></i>
          </el-input>
        </el-form-item>
        <el-form-item>
          <div class="identifybox">
            <div @click="refreshCode">
              <s-identify :identifyCode="identifyCode"></s-identify>
            </div>
            <el-button @click="refreshCode" type='text' class="textbtn">看不清，换一张</el-button>
          </div>
        </el-form-item>
        <el-form-item>
          <el-checkbox v-model="checked" @change="checkChange('loginForm')">记住账号</el-checkbox>
        </el-form-item>
        <el-form-item>
          <el-button type="primary"
                     size="small"
                     @click.native.prevent="handleLogin"
                     class="login-submit">申请</el-button>
        </el-form-item>
      </el-form>
    </el-dialog>

配置js

这里要 import 生成验证码的页面 ，才可以使用

<script>
import SIdentify from '@/components/CertificateVolidate/identify.vue'

export default {
  name: 'CertificateLogin',
  data () {
    // 用户名自定义验证规则
    const validateUsername = (rule, value, callback) => {
      if (!value) {
        callback(new Error('请输入正确的用户名'))
      } else {
        console.log('user', value)
        callback()
      }
    }
    // 验证码自定义验证规则
    const validateVerifycode = (rule, value, callback) => {
			let newVal = value.toLowerCase()
			let identifyStr =	this.identifyCode.toLowerCase()
      if (newVal === '') {
        callback(new Error('请输入验证码'))
      } else if (newVal !== identifyStr) {
        console.log('validateVerifycode:', value)
        callback(new Error('验证码不正确!'))
      } else {
        callback()
      }
		}
    return {
      // show: false,
      activeIndex: '1',
      dialogVisible: false,
      fontstyle: {
        color: 'gray'
      },
      loginForm: {
        username: '',
        password: '',
        verifycode: ''
      },
      checked: false,
      identifyCodes: '1234567890ABCDEFGHIGKLMNoPQRSTUVWXYZ',
      identifyCode: '',
      loginRules: { // 绑定在form表单中的验证规则
        username: [
          { required: true, trigger: 'blur', validator: validateUsername }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, message: '密码长度最少为6位', trigger: 'blur' }
        ],
        verifycode: [
          { required: true, trigger: 'blur', validator: validateVerifycode }
        ]
      },
      passwordType: 'password'
    }
  },

这里注意 要在 components中加上，否则没有视图展现

components: {
  SIdentify
},

created () {
},
mounted () {

  // 验证码初始化
  this.identifyCode = ''
  this.makeCode(this.identifyCodes, 4)
},
filters: {
  checkChange (formName) {
    if (this.checked === true) {
      this.loginForm.username = 'admin'
      this.loginForm.password = '111111'
      this.loginForm.verifycode = ''
    } else {
      this.$nextTick(() => {
        this.$refs[formName].resetFields()
      })
    }
  }
},
computed: {
},
props: [],
methods: {
  	getPhoto () {
  		
  	},
  // 通过改变input的type使密码可见
  showPassword () {
    this.fontstyle.color === 'gray' ? (this.fontstyle.color = 'blue') : (this.fontstyle.color = 'gray') // 改变密码可见按钮颜色
    this.passwordType === ''
      ? (this.passwordType = 'password') : (this.passwordType = '')
  },
  // 点击登入按钮
  handleLogin () {
    this.$refs.loginForm.validate(valid => {
      if (valid) {

        this.$router.push('/apply/Index')
  			} else {
  				this.$router.push('/apply/CertificateLogin')
  			}
    })
  },
  // 生成随机数
  randomNum (min, max) {
    return Math.floor(Math.random() * (max - min) + min)
  },
  // 切换验证码
  refreshCode () {
    this.identifyCode = ''
    this.makeCode(this.identifyCodes, 4)
  },
  // 生成四位随机验证码
  makeCode (o, l) {
    for (let i = 0; i < l; i++) {
      this.identifyCode += this.identifyCodes[this.randomNum(0, this.identifyCodes.length)]
    }
    console.log(this.identifyCode)
  },
  applyFor () {
    this.dialogVisible = true
  },
  handleClose (done) {
    done()
  },
  // handleLogin () {
  //   alert('登陆成功')
  //   this.dialogVisible = false
  // },
  handleSelect (key, keyPath) {
    console.log(key, keyPath)
  }
}
}
</script>
<style scoped>
.identifybox{
  display: flex;
  justify-content: space-between;
  margin-top:7px;
}
.iconstyle{
  color:#409EFF;
  }
</style>

效果展示