Solution to default parameter passing and custom parameter passing of element UI component

The following code

        <div v-for="(item,index) in object.cooperationDepartmentNumber">
          <div class="entrustingPartyList">
            <el-row>
              <el-col :span="12"> 
                <el-form-item label="Co Organizer">
                <el-autocomplete
                  class="inline-input"
                  v-model="object.cooperationDepartment.otherArray[index].unit"
                  :fetch-suggestions="unitQuerySearch"
                  placeholder="Please enter co Organizer"
                  :trigger-on-focus="false"
                  @select="unitHandleSelect"
                ></el-autocomplete>
                </el-form-item>
              </el-col>
              <el-col :span="12"> 
                <el-form-item label="Co operative Department" v-show="interior">
                  <el-input v-model="object.cooperationDepartment.otherArray[index].cooperation" placeholder="Co operative Department"></el-input>
                </el-form-item>
              </el-col>
              <el-col :span="12"> 
                <el-form-item label="Contact person of CO Organizer" v-show="external">
                  <el-input v-model="object.cooperationDepartment.otherArray[index].cooperation" placeholder="Co operative Department"></el-input>
                </el-form-item>
              </el-col>
            </el-row>
          </div>
        </div>

When we have many same components in v-for, we need to know which component is selected. Then we definitely want to know the corresponding [index], and you will think that [item] is the default value

	  <el-col :span="12"> 
	    <el-form-item label="Co Organizer">
	    <el-autocomplete
	      class="inline-input"
	      v-model="object.cooperationDepartment.otherArray[index].unit"
	      :fetch-suggestions="unitQuerySearch"
	      placeholder="Please enter co Organizer"
	      :trigger-on-focus="false"
	      @select="unitHandleSelect(item, index)"
	    ></el-autocomplete>
	    </el-form-item>
	  </el-col>

The solution is to write a closure so that the index represents your first few components

	  <el-col :span="12"> 
	    <el-form-item label="Co Organizer">
	    <el-autocomplete
	      class="inline-input"
	      v-model="object.cooperationDepartment.otherArray[index].unit"
	      :fetch-suggestions="unitQuerySearch"
	      placeholder="Please enter co Organizer"
	      :trigger-on-focus="false"
	      @select="((item)=>{unitHandleSelect(item, index)})"
	    ></el-autocomplete>
	    </el-form-item>
	  </el-col>

In this way, when you call this method, you can know that it corresponds to the first component, and then you can operate on that component.