JavaScript-自测题20

var s = [];
var arr = s;
for(var i = 0; i < 3; i++){
  var pusher = {
    value: "item" + i
  },tmp;

  // i = 0 
  // pusher = {value: "item0"}
  // tmp.children = {value: "item0"}
  // arr = {value: "item0"}
  // s[0] = {value: "item0",children:[{value:"item0"}]}

  if(i !== 2){
    tmp = [];
    pusher.children = tmp;
  }
  arr.push(pusher);
  arr = tmp;
}
console.log(s[0]);

技术点：指针移动