js 做树形数组查询筛选功能

对二级菜单进行搜索查询：

watch: {
    librarySearch(val) {
      if(val == '') {
        this.libraryFiles = this.libraryFilesAll
      }else {
        this.filterNode(val, this.libraryFilesAll);
      }
    },
  },
methods: {
    // 左侧组织树查询筛选
    filterNode(value,allArr) {
      let arr = JSON.parse(JSON.stringify(allArr))
      let newA = []
      arr.forEach((item,ind) => {
        newA[ind] = item
        newA[ind].children = item.children.filter(val => val.tablename.indexOf(value) != '-1')
      })
      for(let i=newA.length; i--; i>0 ) {
        if(!newA[i].children || newA[i].children.length == 0) {
          newA.splice(i,1)
        }
      }
      this.libraryFiles = newA
    }
    //  this.libraryFiles为左侧树数组
}