vue中$set的使用(结合在实际应用中遇到的坑)

<!-- 操作 -->
    <el-table-column label="操作">
     <template slot-scope="scope">
      <span class="poi icon-hover f16 mr20" @click='scope.row.edit=!scope.row.edit'>
       <svg-icon :icon-class="scope.row.edit?'icon_edit_outline':'icon_save'"></svg-icon>
      </span>
      <span class="poi icon-hover f16">
       <svg-icon icon-class="icon_delete"></svg-icon>
      </span>
     </template>
    </el-table-column>
    <!-- 操作 -->

export default {
 name: 'strategic',
 data() {
  return {
   tableData: [{
    'pp_id': 4,
    'brand_name': '1414', 
    'project_name': '得意', 
    'description': '的u会回来会', 
    'publish_time': '2018-07-23',
    'is_used': 0 
   }]
  }
 },
 components: { },
 computed: {
 },
 created() {
  this.initTableData()
 },
 methods: {
  initTableData() {
   this.tableData.forEach(element => {
    element.edit = false
   })
  }
 }
}

data() {
  return {
   tableData: [{
    'pp_id': 4,
    'brand_name': '1414',
    'project_name': '1414',
    'description': '7588888888',
    'publish_time': '2018-07-23',
    'is_used': 0,
    'edit': false
   }]
  }
 }  

initTableData() {
 this.tableData.forEach(element => {
   this.$set(element, 'edit', false)
 })
}