dandanyajin
今天更新博客了吗?

在使用递归时,出现了一些问题。

正常走完循环赋值正确后,会莫名其妙回到for这行代码,xdata,ydata会再次变为null,直接走到return

recursion(drilldownList,name){
  var xdata = null
  var ydata = null
  for(var i = 0;i < drilldownList.length;i++){
    if(name == drilldownList[i].name){
      xdata = drilldownList.map((item)=>item.name),
      ydata = drilldownList.map((item)=>item.value)
      break
     }else{
      if(drilldownList[i].children){
        this.recursion(drilldownList[i].children,name)
      }
     }
  }
  return [xdata,ydata]
},

 


修改后的,定义变量放在了循环里面,符合条件就return ,不符合条件进入新的循环结果赋值给变量return变量

recursion(drilldownList,name){
  let _this=this
  for(var i = 0;i < drilldownList.length;i++){
    var xdata = null
    var ydata = null
    if(name == drilldownList[i].name){
      xdata = drilldownList.map((item)=>item.name),
      ydata = drilldownList.map((item)=>item.value)
      return [xdata,ydata]
    }else{
      if(drilldownList[i].children){
        let res = _this.recursion(drilldownList[i].children,name)
        if(res){
          return res
        }
      }
    }
  }
}

 

posted on 2022-03-16 14:02  dandanyajin  阅读(67)  评论(0编辑  收藏  举报