1.请封装一个js方法，遍历树结构，当节点的children为空时，删除children

Question

var tree = [
{
a:1,
b:2,
children:[
{
a-1:111,
children:[]
}
]
}，
{
a:2,
b:2,
children:[]
}
]

Answer 1

  function deleteChildren(arr) {
      let childs = arr
      for (let i = childs.length; i--; i > 0) {
        if (childs[i].children) {
          if (childs[i].children.length) {
            this.deleteChildren(childs[i].children)
          } else {
            delete childs[i].children
          }
        }
      }
      return arr
    }