以登录界面为例(效果图)

新建验证码组件 SIdentity

<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: 16
            },
            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: 38
            }
        },
        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 < 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>
    .s-canvas {
        height: 38px;
    }

    canvas {
        margin-top: 1px;
        margin-left: 8px;
    }
</style>

在所需界面中引入组件(HTML代码如下)

<template>
   <div class="aric-main">
    <img src="../assets/thbg.png">
    <el-form :model="ruleForm" status-icon :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm aric-login-form">
      <el-form-item label="用户名" prop="username">
        <el-input placeholder="请输入手机号" v-model.number="ruleForm.username" clearable></el-input>
      </el-form-item>
      <el-form-item label="密码" prop="pass">
        <el-input placeholder="请输入密码" type="password" v-model="ruleForm.pass" show-password clearable></el-input>
      </el-form-item>
      <el-form-item label="验证码" prop="validate">
        <el-input class="aric-yanzheng" placeholder="请输入验证码" type="text" v-model="ruleForm.validate"></el-input>
        <div class="login-code" @click="refreshCode">
          <Identify :identifyCode="identifyCode"></Identify>
        </div>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="submitForm('ruleForm')">提交</el-button>
        <el-button @click="registerClick">注册</el-button>
        <span class="aric-foget-btn" @click="Forgetpass">?忘记密码</span>
      </el-form-item>
    </el-form>
  </div>
</template>

JS代码如下

<script>
  import Identify from '../components/SIdentity.vue';
  export default {
    name: 'login',
    template: {
    },
    components: {
      Identify
    },
    data() {
      var checkPhone = (rule, value, callback) => {
        if (!value) {
          return callback(new Error('手机号不能为空'));
        } else {
          const reg = /^1[3|4|5|7|8][0-9]\d{8}$/
          console.log(reg.test(value));
          if (reg.test(value)) {
            callback();
          } else {
            return callback(new Error('手机号格式错误'));
          }
        }
      };
      const validateVerifycode = (rule, value, callback) => {
        if (!value) {
            callback(new Error('请输入验证码'));
        } else if (value != this.identifyCode) {
            console.log('validateVerifycode:', value)
            this.ruleForm.validate = ''
            this.refreshCode()
            callback(new Error('验证码不正确!'));
        } else {
            callback();
        }
      };
      return {
        // isDebugLogin: false,
        identifyCodes: '123456789',
        identifyCode: '',
        ruleForm: {
          pass: '',
          username: '',
          validate: ''
        },
        rules: {
          username: [
            // { required: true, message: '请输入用户名', trigger: 'blur' },
            // { min: 3, max: 8, message: '长度为 3 到 8 个字符', trigger: 'blur' }
            { validator: checkPhone, required: true, trigger: 'blur' }
          ],
          pass: [
            { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 6, max: 17, message: '长度为 6 到 17 个字符', trigger: 'change' }
          ],
          validate: [
            { validator: validateVerifycode, required: true, trigger: 'blur' }
          ]
        }
      };
    },
    mounted () {
      // 初始化验证码
      this.identifyCode = ''
      this.makeCode(this.identifyCodes, 4)
    },
    methods: {
      randomNum(min, max) {
        return Math.floor(Math.random() * (max - min) + min)
      },
      refreshCode() {
        this.identifyCode = ''
        this.makeCode(this.identifyCodes, 4)
      },
      makeCode(o, l) {
        for (let i = 0; i < l; i++) {
          this.identifyCode += this.identifyCodes[
            this.randomNum(0, this.identifyCodes.length)
          ]
        }
      },
      submitForm(formName) {
        this.$refs[formName].validate((valid) => {
          console.log(valid)
          if (valid) {
            alert('submit!');
            // 发送请求给后台,请求数据成功之后
            this.$router.push('/home')
          } else {
            console.log('error submit!!');
            return false;
          }
        });
      },
      created() {
        this.refreshCode()
      },
      registerClick() {
        this.$router.push('/register');
      },
      Forgetpass() {
        this.$router.push( '/forget' )
      }
    }
  }
</script>