JavaScript 经验总结【持续更新】

 　　/**
     * 选择下拉选项
　　　* params {}
     */
    selectChange({ value }) {
      base.getitemlist(value).then(res => {
        this.tableData = res.content; // [data1,data2,data3,data4]
        this.filterEvent() // [data1,data2]
      })
    },
    /**
     * 过滤已添加数据
     */
    filterEvent() {
      if (this.filterData === null) return
      this.tableData = this.tableData.filter(x => !this.filterData.some(e => e.name === x.name)) // [data3,data4]
    }

　　 /**
     * 存储对应树节点已存在内容
     * params:  path,type
     * path：   (层级) {27,32,55,81}
     * type:    类型 root | children | self
     * retrun:  返回返回对应的行数据
     */
    forEachPathElement(path, type) {
      if (!path) return
      let pathArr = path.replace(‘{‘, ‘‘).replace(‘}‘, ‘‘).split(‘,‘)
      if (type == ‘root‘) pathArr = pathArr.slice(0, 1)
      else if (type == ‘self‘) pathArr = pathArr.slice(0, -1)
      if (pathArr.length <= 0) return
      let filterData = [...this.treeData]
      for (let index = 0; index < pathArr.length; index++) {
        const item = parseInt(pathArr[index])
        if (index == 0) {
          filterData = filterData.find(e => e.id === item)
        } else {
          filterData = filterData.children.find(e => e.id === item)
        }
      }
      if (type != ‘root‘) filterData = filterData.children
      return filterData
    }