WALL*E

<div class="purchase-course">
  <el-checkbox v-model="allChecked" @change="handleSelectAllClassfiy">全選</el-checkbox>
</div>
<div class="intent-course-wrapper">
  <div class="class-category" v-for="(firItem, firIndex) in tabledata" :key="firIndex">
    <div class="intent-course-header">
      <!-- 兩層多選+ 標(biāo)簽頁 -->
      <el-checkbox v-model="firItem.mychecked" @change="firstChanged(firIndex)"></el-checkbox>
      <el-tabs v-model="activeName" tab-position="left" @tab-click="handleClick">
        <el-tab-pane :label="firItem.typeName" :name="firItem.typeName">
          <!-- 第二層 -->
          <div class="class-details" v-for="(subItem, subIndex) in firItem.dataK" :key="subIndex">
            <el-checkbox v-model="subItem.mychecked" @change="secondChanged(firIndex)"></el-checkbox>
            <div class="sub-details">
              <p class="course-name">{{ subItem.name }}</p>
            </div>
          </div>
        </el-tab-pane>
      </el-tabs>
    </div>
  </div>
</div>

computed:{
  // 全選功能
  allChecked: {
    get () {
      let count = 0;
      for (let i = 0; i < this.tabledata.length; i += 1) {
        if (this.tabledata[i].mychecked === true) {
          count += 1;
        } else {
          count -= 1;
        }
      }
      if (count === this.tabledata.length) {
        return true;
      }
      return false;
    },
    set (val) {
      return val;
    }
  }
},
methods:{
handleClick(tab, event) {
  // console.log(tab, event);
},
// 一級change事件
firstChanged(index) {
  const { dataK } = this.tabledata[index];
  if (this.tabledata[index].mychecked === false) {
    dataK.forEach((item) => {
      this.$set(item, 'mychecked', false);
    });
  } else {
    dataK.forEach((item) => {
      this.$set(item, 'mychecked', true);
    });
  }
},
// 二級change事件
secondChanged(index) {
  const subData = this.tabledata[index].dataK;
  let tickCount = 0;
  const len = subData.length;
  for (let i = 0; i < len; i += 1) {
    if (subData[i].mychecked === true) {
      tickCount += 1;
    } else {
      tickCount -= 1;
    }
  }
  if (tickCount === len) {
    // 二級全勾選  一級勾選
    this.$set(this.tabledata[index], 'mychecked', true);
  } else {
    // 二級未全選  一級不勾選
    this.$set(this.tabledata[index], 'mychecked', false);
  }
},
// 總的全選
handleSelectAllClassfiy(val) {
  if (val) {
    for (let i = 0; i < this.tabledata.length; i += 1) {
      this.tabledata[i].mychecked = true;
      this.firstChanged(i); // 調(diào)用一級change事件
    }
  } else {
    for (let i = 0; i < this.tabledata.length; i += 1) {
      this.tabledata[i].mychecked = false;
      this.firstChanged(i); // 調(diào)用一級change事件
    }
  }
},
}