Vue中@change、@input和@blur、@focus的区别及@keyup用法

<!-- 下拉搜索框 -->
        <el-select 
          v-model="listQuery.productId"
          clearable 
          placeholder="请选择协议号"
          filterable 
          class="filter-item"
          @change="handleFilter"   //添加@change事件，并调用筛选函数handleFilter()
         >
          <el-option
            v-for="item in productList"
            :key="item.id"
            :label="item.productId"
            :value="item.productId"
            :title="item.productId"
            style="width: 200px">
          </el-option>
        </el-select>

<el-input 
	v-model="listQuery.nameParam" 
	maxlength="30" 
	placeholder="请输入手机号或用户名" 
	style="width: 200px"
  	class="filter-item" 
  	clearable 
  	@clear="handleFilter"   //用户点击清空按钮则调用筛选函数，返回所有列表
  	@keyup.enter.native="handleFilter" />  //输入后按enter键则调用筛选函数，返回满足条件的列表

@change="change(val, index)"

@change="((val)=>{change(val, index)})"

<div v-for="(item,index) in itemList">
   <el-input
           v-model="item.value"
           @change="((val)=>{doSomething(val, index)})">
           
   </el-input>
 </div>