vue的ref与$refs

 一. ref使用在父组件上

父组件html：

　　<information ref='information'></information>

　　import information from './information'

　　components:{information,bill,means},

在父组件上使用子组件的值，js :this.$refs.information.isAdd;   isAdd是information组件的data的属性。

二.ref使用在元素上

例如本组件html：

<span ref="myspan" class="redmy">23232</span>

本组件js使用：this.$refs["myspan"].className  //redmy

this.$refs["myspan"]   指代对象//<span class="redmy">23232</span>

三.ref使用在子组件上

子组件上有

<h5 ref='insideDomRef'>我是子组件</h5>

父组件上可以引用子组件的值：this.$refs.insideDomRef// <h5 >我是子组件</h5>





实例

这是父组件：

<template><div>
  <el-form :model="dynamicValidateForm" ref="dynamicValidateForm" 
      label-width="100px" class="demo-dynamic">

  <el-form-item prop="email" label="邮箱" :rules="[{required: true,message:'请输入邮箱地址', trigger:'blur' },{type:'email',message:'请输入正确的邮箱地址',trigger:'blur,change'}]">
    <el-input v-model="dynamicValidateForm.email" ref="myemail"></el-input>
  </el-form-item>

  <el-form-item v-for="(domain, index) in dynamicValidateForm.domains" :label="'域名' + index"
      :key="domain.key" :prop="'domains.' + index + '.value'" :rules="{required: true, message: '域名不能为空', trigger: 'blur'}">
      <el-input v-model="domain.value"></el-input>
      <el-button @click.prevent="removeDomain(domain)">删除</el-button>
  </el-form-item>

  <span ref="myspan" class="redmy">23232</span>

  <el-form-item>
    <el-button type="primary" @click="submitForm('dynamicValidateForm')">提交</el-button>
    <el-button @click="addDomain">新增域名</el-button>
    <el-button @click="resetForm('dynamicValidateForm')">重置</el-button>
  </el-form-item>

</el-form>

<childone ref="childonemyyy"></childone>
</div>
</template>
<script>
import childone from './childone'
  export default {
    components:{childone},
    data() {
      return {
        dynamicValidateForm: {
          domains: [{
            value: ''
          }],
          email: '',
          spanval:'',
        }
      };
    },
    methods: {
      submitForm(formName) {

        this.$refs["childonemyyy"].isAdd;//"mychildone"用在父组件上引用子组件值，返回子组件上的data数据
        this.$refs["myspan"].className  //redmy  用在元素上，返回元素节点对象

        this.$refs[formName].validate((valid) => {

          if (valid) {
            alert('submit!'+this.$refs[formName].email);
          } else {
            console.log('error submit!!');
            return false;
          }
        });
      },
      resetForm(formName) {
        this.$refs[formName].resetFields();
      },
      removeDomain(item) {
        var index = this.dynamicValidateForm.domains.indexOf(item)
        if (index !== -1) {
          this.dynamicValidateForm.domains.splice(index, 1)
        }
      },
      addDomain() {
        this.dynamicValidateForm.domains.push({
          value: '',
          key: Date.now()
        });
      }
    }
  }
</script>

这是子组件：

<template><div>
    <p class="ppp">我是p段落，我是子组件一</p>
    <el-button @click="submit">子组件</el-button>
    </div>
</template>
<script type="text/javascript">
     export default {
         data(){
             return{
                 isAdd:"mychildone",
             }
         },
         methods:{
             submit(){
                 

} }, created(){ } } </script>

jieshu