deepClone 深克隆

function deepClone(obj) {
  var result = Array.isArray(obj) ? [] : {};
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (typeof obj[key] === "object") {
        result[key] = deepClone(obj[key]); 
      } else {
        result[key] = obj[key];
      }
    }
  }
  return result;
}