组件通信

事件触发
父组件

  <div class="step-container">
    <!-- 步骤条显示 -->
    <el-steps :active="activeStep" finish-status="success">
      <el-step title="信息填写" />
      <el-step title="身份验证" />
      <el-step title="完成注册" />
    </el-steps>

    <!-- 根据当前步骤显示对应组件 -->
    <div class="step-content">
      <Step1 v-if="activeStep === 0" @next-step="nextStep" />
      <Step2 v-if="activeStep === 1" @next-step="nextStep" />
      <Step3 v-if="activeStep === 2" @next-step="nextStep" />
    </div>
  </div>
</template>

<script setup>
import { ref } from 'vue'
import Step1 from './Step1.vue'
import Step2 from './Step2.vue'
import Step3 from './Step3.vue'

const activeStep = ref(0)

// 处理下一步逻辑
const nextStep =  => {
  if (activeStep.value < 2) {
    activeStep.value++
  }
}
</script>

子组件

<template>
  <div class="step1">
    <h2>步骤1：信息填写</h2>
    <el-form :model="form" :rules="rules" ref="form">
      <el-form-item label="用户名" prop="username">
        <el-input v-model="form.username"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="submitForm">提交</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script setup>
import { ref, defineEmits } from 'vue'

// 定义子组件可触发的事件
const emit = defineEmits(['next-step'])

const form = ref({
  username: ''
})

const rules = ref({
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' }
  ]
})

// 表单提交处理
const submitForm =  => {
  // 触发父组件的nextStep方法
  emit('next-step')
}
</script>