递归循环调用

js多次调用接口，全部成功之后执行

handleDownload() {
      this.count = 3
      this.imgList = []
      this.addImgUrl()
    },
    addImgUrl() {
      if(this.count > 0) {
        this.getImgUrl().then((res) => {
          this.imgList.push(res)
          this.count--
          this.addImgUrl()
        })
      } else {
        console.log('imgList', this.imgList)
      }
    },

    getImgUrl() {
      return new Promise((resolve, reject) => {
        let timeValue = Math.floor(Math.random()*5+1)
        console.log(timeValue)
        setTimeout(() => {
          let url = `url${timeValue}`
          console.log(url)
          resolve(url)
        }, timeValue * 1000)
      })
    }

输出

5
url5
3
 url3
 4
url4
imgList (3)["url5", "url3", "url4", __ob__: Observer]

多层数组嵌套循环输出

let arr = [
  {name: 'aaa', children:[ {name: 'bbb', children: [{name:  'cccc'}]}]},
  {name: 'ddd', children:[{name: 'rrr', children: [{name:  'fff'}]}]},
  {name: 'asdf'}
]

// 遍历循环
func1() {
  this.getDateForSelectAll(arr)
},
getDateForSelectAll(arr) {
  arr.map((item) => {
    console.log(item.name)
    if (item.children && item.children.length > 0) {
      this.getDateForSelectAll(item.children)
    }
  })
},