因产品需求和UI样式调整，和element自带的下拉多选有冲突，索性自己尝试修改如下：

下拉加多选框

效果如下图：

封装如下：

<template>
  <div class="select-checked">
    <!-- 下拉加多选框 -->
    <el-select
      v-model="value"
      multiple
      placeholder="请选择"
      :popper-append-to-body="false"
      @remove-tag="removeTag"
    >
      <el-option
        v-for="item in options"
        :key="item.value"
        :label="item.label"
        :value="item.value"
      >
        <el-checkbox v-model="item.check" @change="isChecked(item)">
          {{ item.label }}
        </el-checkbox>
      </el-option>
    </el-select>
    {{ value }}
  </div>
</template>

<script>
export default {
  name: 'SelectChecked',
  components: {},
  props: {
    options:{
      type: Array
    }
  },
  data() {
    return {
      value: []
    }
  },
  methods: {
    // 多选框触发
    isChecked(item) {
      if (item.check && this.value.indexOf(item.value) == -1) {
        this.value.push(item.value)
      } else if (!item.check) {
        this.value.forEach((elm, idx) => {
          if (elm == item.value) {
            this.value.splice(idx, 1)
          }
        })
      }
      this.$emit('selectedVal', this.value)
    },
    // 多选模式下移除tag时触发
    removeTag(value) {
      this.options.forEach((elm, idx) => {
        if (elm.value == value) {
          elm.check = false
        }
      })
      this.$emit('selectedVal', this.value)
    }
  }
}
</script>

<style lang="scss">
.select-checked {
  .el-select-dropdown.is-multiple .el-select-dropdown__item.selected::after {
    content: '';
  }
  .el-checkbox {
    width: 100%;
    padding: 0 30px;
    .el-checkbox__label {
      margin-left: 20px;
    }
  }
  .el-select-dropdown__item {
    padding: 0;
  }
}
</style>

页面中使用

<!--  -->
<template>
  <div class="content-box">
    <div class="container">
      <SelectChecked :options="options" @selectedVal="selectedVal" />
    </div>
  </div>
</template>

<script>
import SelectChecked from '@/components/Select/SelectChecked'
export default {
  name: 'record',
  components: {
    SelectChecked
  },
  data() {
    return {
  	  options: [
        {
          value: '001',
          label: '黄金糕',
          check: false
        },
        {
          value: '002',
          label: '双皮奶',
          check: false
        },
        {
          value: '003',
          label: '蚵仔煎',
          check: false
        },
        {
          value: '004',
          label: '龙须面',
          check: false
        },
        {
          value: '005',
          label: '北京烤鸭',
          check: false
        }
      ],
    }
  },
  watch: { },
  computed: {},
  methods: {
    selectedVal(value){
      console.log(111, value); // 获取子组件选项的值
    }
  },
  created() {
    console.log('created-record')
  },
  activated() {
    console.log('created-record')
  },
  mounted() {}
}
</script>

<style lang="scss">
</style>

升级—添加全部选项

<template>
  <div class="select-checked">
    <!-- 下拉加多选框 -->
    <el-select
      v-model="value"
      multiple
      placeholder="请选择"
      :popper-append-to-body="false"
      @remove-tag="removeTag"
    >
      <el-option
        v-for="item in options"
        :key="item.value"
        :label="item.label"
        :value="item.value"
      >
        <el-checkbox v-model="item.check" @change="isCheck(item)">
          {{ item.label }}
        </el-checkbox>
      </el-option>
    </el-select>
    {{ value }}
  </div>
</template>

<script>
export default {
  name: 'SelectChecked',
  components: {},
  props: {
    options: {
      type: Array
    }
  },
  data() {
    return {
      value: []
    }
  },
  methods: {
    // 多选框触发
    isCheck(item) {
      if (item.check && item.value == 'all') {
        this.value = []
        this.options.forEach(element => {
          element.check = true
          this.value.push(element.value)
        })
      } else if (!item.check && item.value == 'all') {
        this.value = []
        this.options.forEach(element => {
          element.check = false
        })
      }
      if (
        item.check &&
        this.value.indexOf(item.value) == -1 &&
        item.value !== 'all'
      ) {
        this.value.forEach((elm, idx) => {
          if (elm == 'all') {
            this.value.splice(idx, 1)
          }
        })
        this.value.push(item.value)
        if (this.value.length == this.options.length - 1) {
          this.options[0].check = true
          this.value.unshift('all')
        } else {
          this.options[0].check = false
        }
      } else if (!item.check && item.value !== 'all') {
        this.options[0].check = false
        this.value.forEach((elm, idx) => {
          if (elm == item.value || elm == 'all') {
            this.value.splice(idx, 1)
          }
        })
      }
      this.$emit('selectedVal', this.value)
    },
    // 多选模式下移除tag时触发
    removeTag(value) {
      if (value == 'all') {
        this.options.forEach((elm, idx) => {
          elm.check = false
        })
        this.value = []
      } else {
        this.options.forEach((elm, idx) => {
          if (elm.value == value || elm.value == 'all') {
            elm.check = false
          }
        })
      }
      this.$emit('selectedVal', this.value)
    }
  }
}
</script>

<style lang="scss">
.select-checked {
  .el-select-dropdown.is-multiple .el-select-dropdown__item.selected::after {
    content: '';
  }
  .el-checkbox {
    width: 100%;
    padding: 0 30px;
    .el-checkbox__label {
      margin-left: 20px;
    }
  }
  .el-select-dropdown__item {
    padding: 0;
  }
}
</style>

组件中使用

<!--  -->
<template>
  <div class="content-box select-checked">
    <div class="container">
      <SelectChecked :options="options" @selectedVal="selectedVal" />
    </div>
  </div>
</template>

<script>
import SelectChecked from '@/components/Select/SelectChecked'
export default {
  name: 'record',
  components: {
    SelectChecked
  },
  data() {
    return {
      options: [
        {
          value: 'all',
          label: '全部',
          check: false
        },
        {
          value: '001',
          label: '黄金糕',
          check: false
        },
        {
          value: '002',
          label: '双皮奶',
          check: false
        },
        {
          value: '003',
          label: '蚵仔煎',
          check: false
        },
        {
          value: '004',
          label: '龙须面',
          check: false
        },
        {
          value: '005',
          label: '北京烤鸭',
          check: false
        }
      ],
      value1: []
    }
  },
  watch: {
   
    }
  },
  computed: {},
  methods: {
    selectedVal(value){
      // 注意这里如果有全部的话，要去掉全部
      value.forEach((item,idx )=>{
        if(item == 'all'){
          value.splice(idx, 1)
        }
      })
      console.log(111, value);
    }
  },
  created() {
    console.log('created-record')
  },
  activated() {
    console.log('created-record')
  },
  mounted() {}
}
</script>

<style lang="scss">
.select-checked {
  .el-select-dropdown.is-multiple .el-select-dropdown__item.selected::after {
    content: '';
  }
  .el-checkbox {
    width: 100%;
    padding: 0 30px;
    .el-checkbox__label {
      margin-left: 20px;
    }
  }
  .el-select-dropdown__item {
    padding: 0;
  }
}
</style>

效果如下图

需求改版完善

感谢龙哥指导和帮忙

<template>
  <div class="select-checked">
    <el-select
      :value="selected"
      multiple
      placeholder="请选择"
      :popper-append-to-body="false"
    >
      <el-option :value="''" label="全部" class="multiple">
        <el-checkbox v-model="optionsAll" @change="handleoptionsAllChange">
          全部
        </el-checkbox>
      </el-option>
      <el-option
        class="multiple"
        :value="key"
        :label="item"
        v-for="(item, key) in optionsData"
        :key="key"
      >
        <el-checkbox
          :value="selectedOptions.includes(key)"
          @change="handleTaskItemChange(key)"
        >
          {{ item }}
        </el-checkbox>
      </el-option>
    </el-select>
  </div>
</template>

<script>
export default {
  name: 'Select',
  components: {},
  props: {
    options: {
      type: Object
    }
  },
  data() {
    return {
      optionsData: {},
      optionsAll: true,
      selectedOptions: [],
    }
  },
  watch: {
    options: {
      handler(newVal) {
        console.log(newVal)
        this.optionsData = newVal
        this.selectedOptions = Object.keys(newVal) 
      },
      immediate: true, // 该值默认是false，在进入页面时，第一次绑定值，不会立刻执行监听，只有数据发生改变才会执行handler中的操作
      // deep: true, // deep 深度
    },
  },
  computed: {
    selected() {
      if (
        this.selectedOptions.length === Object.keys(this.optionsData).length
      ) {
        return ['']
      } else {
        return this.selectedOptions
      }
    }
  },
  methods: {
    handleoptionsAllChange(isAll) {
      if (isAll) {
        this.selectedOptions = Object.keys(this.optionsData)
      } else {
        this.selectedOptions = []
      }
    },
    handleTaskItemChange(key) {
      if (this.selectedOptions.includes(key)) {
        this.selectedOptions.splice(this.selectedOptions.indexOf(key), 1)
      } else {
        this.selectedOptions.push(key)
      }
      this.optionsAll =
        this.selectedOptions.length === Object.keys(this.optionsData).length
    }
  }
}
</script>

<style lang="scss">
.select-checked {
  .el-select-dropdown.is-multiple .el-select-dropdown__item.selected::after {
    content: '';
  }
  .el-checkbox {
    width: 100%;
    padding: 0 30px;
    .el-checkbox__label {
      margin-left: 20px;
    }
  }
  .el-select-dropdown__item {
    padding: 0;
  }
  .el-tag__close,
  .el-icon-close {
    display: none;
  }
  .el-tag.el-tag--info {
    background: transparent;
    border: 0;
  }

  .el-select {
    .el-select__tags {
      flex-wrap: nowrap;
      overflow: hidden;
    }
    .el-tag {
      background-color: #fff;
      border: none;
      color: #606266;
      font-size: 13px;
      padding-right: 0;
      & ~ .el-tag {
        margin-left: 0;
      }
      &:not(:last-child)::after {
        content: ',';
      }
    }
  }
}
</style>

组件使用：

<!--  -->
<template>
  <div class="content-box select-checked">
    <div class="container">
      <Select :options="optionsData" @selected="selected" />
    </div>
  </div>
</template>

<script>
import Select from '@/components/Select/Select'

export default {
  name: 'record',
  components: {
    Select
  },
  data() {
    return {
      optionsData: {
        '001': '黄金糕',
        '002': '双皮奶',
        '003': '蚵仔煎',
        '004': '龙须面',
        '005': '北京烤鸭'
      },
    }
  },
  watch: {},
  computed: {},
  methods: {
	selected(value){
      console.log(value);
      let str = value.join()
      console.log(str)
      // 注意选项为全部时数据里面的值为空字符串和无的情况
      if(value.includes('') || value.length === 0){
        console.log(Object.keys(this.optionsData).join());
      }
    }
  },
  created() {
    console.log('created-record')
  },
  activated() {
    console.log('created-record')
  },
  mounted() {}
}
</script>


<style lang="scss" scoped>

</style>

效果如下：

因上面是对象格式数据，操作起来可能会不方便，我重新整理了一下数组对象格式数据，如下

<template>
  <div class="select-checked">
    <el-select
      :value="selected"
      :class="{ all: optionsAll }"
      multiple
      placeholder="请选择"
      :popper-append-to-body="false"
    >
      <el-option :value="''" label="全部" class="multiple">
        <el-checkbox v-model="optionsAll" @change="handleoptionsAllChange">
          全部
        </el-checkbox>
      </el-option>
      <el-option
        class="multiple"
        :value="item.value"
        :label="item.label"
        v-for="(item, key) in optionsData"
        :key="key"
      >
        <el-checkbox v-model="item.check" @change="handleTaskItemChange(item)">
          {{ item.label }}
        </el-checkbox>
      </el-option>
    </el-select>
  </div>
</template>

<script>
export default {
  name: 'Select',
  components: {},
  props: {
    options: {
      type: Array
    }
  },
  data() {
    return {
      optionsData: [],
      optionsAll: true,
      selectedOptions: []
    }
  },
  watch: {
    options: {
      handler(newVal) {
        this.optionsData = newVal
        newVal.forEach(item => {
          if (item.check) {
            this.selectedOptions.push(item.value)
          }
        })
      },
      immediate: true
      // deep: true, // 深度监听
    }
  },
  computed: {
    selected() {
      if (this.selectedOptions.length === this.options.length) {
        return ['']
      } else {
        return this.selectedOptions
      }
    }
  },
  methods: {
    handleoptionsAllChange(isAll) {
      if (isAll) {
        this.optionsData.forEach((elm, idx) => {
          elm.check = true
          this.selectedOptions.push(elm.value)
        })
      } else {
        this.optionsData.forEach((elm, idx) => {
          elm.check = false
        })
        this.selectedOptions = []
      }
      this.$emit('selected',this.selectedOptions)
    },
    handleTaskItemChange(item) {
      // console.log(item)
      // 这里是取出下标的方法，可以封装写出去
      Array.prototype.getArrayIndex = function (obj) {
        for (var i = 0; i < this.length; i++) {
          if (this[i] === obj) {
            return i
          }
        }
        return -1
      }
      if (!item.check) {
        this.optionsData.forEach((elm, idx) => {
          if (item.value == elm.value) {
            let index = this.selectedOptions.getArrayIndex(item.value)
            this.selectedOptions.splice(index, 1)
          }
        })
      } else {
        this.optionsData.forEach((elm, idx) => {
          if (item.value == elm.value) {
            this.selectedOptions.push(elm.value)
          }
        })
      }
      this.optionsAll = this.selectedOptions.length === this.optionsData.length
      // console.log(this.selectedOptions, this.optionsData)
      this.$emit('selected', this.selectedOptions)
    }
  }
}
</script>

<style lang="scss">
.select-checked {
  .el-select-dropdown.is-multiple .el-select-dropdown__item.selected::after {
    content: '';
  }
  .el-checkbox {
    width: 100%;
    padding: 0 30px;
    .el-checkbox__label {
      margin-left: 20px;
    }
  }
  .el-select-dropdown__item {
    padding: 0;
  }
  .el-tag__close,
  .el-icon-close {
    display: none;
  }
  .el-tag.el-tag--info {
    background: transparent;
    border: 0;
  }

  .el-select {
    .el-select__tags {
      flex-wrap: nowrap;
      overflow: hidden;
    }
    .el-tag {
      background-color: #fff;
      border: none;
      color: #606266;
      font-size: 13px;
      padding-right: 0;
      & ~ .el-tag {
        margin-left: 0;
      }
      &:not(:last-child)::after {
        content: ',';
      }
    }
  }
}
</style>

组件中使用

<!--  -->
<template>
  <div class="content-box select-checked">
    <div class="container">
      <Select :options="options" @selected="selected"/>
    </div>
  </div>
</template>

<script>
import SelectTest from '@/components/Select/Select'

export default {
  name: 'record',
  components: {
    Select,
  },
  data() {
    return {
      options: [
        {
          value: '001',
          label: '黄金糕',
          check: true
        },
        {
          value: '002',
          label: '双皮奶',
          check: true
        },
        {
          value: '003',
          label: '蚵仔煎',
          check: true
        },
        {
          value: '004',
          label: '龙须面',
          check: true
        },
        {
          value: '005',
          label: '北京烤鸭',
          check: true
        }
      ],
    }
  },
  watch: {
   
  },
  computed: {},
  methods: {
    selected(value){
      console.log(value);
    }
  },
  created() {
    console.log('created-record')
  },
  activated() {
    console.log('created-record')
  },
  mounted() {}
}
</script>

效果如下：

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