clone

function clone(obj) {
  if ((typeof (obj) == "object") && (obj != null)) {
    if (obj instanceof Array) {
      //如果是Array
      let newObj = [];
      for (let i = 0; i < obj.length; i++) {
        if (typeof (obj[i]) == "object") {
          newObj[i] = clone(obj[i]);
        } else {
          newObj[i] = obj[i];
        }
      }
      return newObj;
    } else {
      //如果是Object
      let newObj = {};
      for (let i in obj) {
        if (typeof (obj[i]) == "object") {
          newObj[i] = clone(obj[i]);
        } else {
          newObj[i] = obj[i];
        }
      }
      return newObj;
    }
  } else {
    return obj;
  }
}