网上看了别人写的控件，bug太多，于是仿着自己写了一个

控件：checkableSelect.vue

<template>
  <el-select v-bind="$attrs" v-model="selectedValue" multiple @change="changeSelect">
    <el-option v-if="dataSource.length" label="全选" :value="selectAll">
      <el-checkbox v-model="selectedAll" @click.prevent.native>全选</el-checkbox>
    </el-option>
    <el-option v-for="item in dataSource" :key="item[valueProp]" :label="item[textProp]" :value="item[valueProp]">
      <el-checkbox v-model="item[checkedProp]" @click.prevent.native>{{item[textProp]}}</el-checkbox>
    </el-option>
  </el-select>
</template>

<script>
  import Linq from "linq";
  export default {
    name: "checkableSelect",
    model: {
      event: "change"
    },
    props: {
      value: Array,
      source: Array,
      textProp: String,
      valueProp: String,
      checkedProp: String
    },
    data() {
      return {
        selectAll: this.newGuid(),
        selectedAll: false
      }
    },
    computed: {
      selectedValue: {
        get: function () {
          return this.value;
        },
        set: function (val) {
          if (val.includes(this.selectAll))
              this.selectedAll = !this.selectedAll;
            
          this.dataSource.forEach(item => {
            if (val.includes(this.selectAll)) {
              item[this.checkedProp] = this.selectedAll;
            }
            else {
              if (val.includes(item[this.valueProp]))
                item[this.checkedProp] = true;
              else
                item[this.checkedProp] = false;
            }
          });

          if(Linq.from(this.dataSource).all(item=> item[this.checkedProp] == true ))
            this.selectedAll = true;
          else
            this.selectedAll = false;
          this.$forceUpdate();
        }
      },
      dataSource: {
        get: function () {
          return this.source;
        },
        set: function (val) {
          //debugger
        }
      }
    },
    watch: {
      selectedValue: function (newValue) {
        //debugger
      },
      dataSource: function (newValue) {
        //debugger
        if(this.dataSource.length > 0 
          && Linq.from(this.dataSource).all(item=> item[this.checkedProp] == true ))
            this.selectedAll = true;
          else
            this.selectedAll = false;
      }
    },
    created() {

    },
    methods: {
      changeSelect(val) {
        var values = Linq.from(this.dataSource).where(x => x[this.checkedProp]).select(x => x[this.valueProp]).toArray();
        this.$emit("change", values);
      },
      newGuid() {
        return 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'.replace(/[x]/g, function (c) {
          var r = Math.random() * 16 | 0,
            v = c == 'x' ? r : (r & 0x3 | 0x8);
          var result = v.toString(16);
          return result;
        });
      }
    }
  }
</script>

使用：

import checkableSelect from "../tools/checkableSelect"

<checkableSelect style="width:100%;" v-model="gradesViewModel" :source="grades" @change="gradesChange"
                                    :textProp="'label'" :valueProp="'value'" placeholder="请选择适用年级">
                                </checkableSelect>