code: function clone(obj) {
              var cloned = {};
              for (var m in obj) {
                  if (obj.hasOwnProperty(m)) {
                      cloned[m] = obj[m];
                  }
              }
              return cloned;
          }
docs: @method clone()
  @for kity.Utils
  @grammar clone(obj) => {object}
  @description 返回一个对象的克隆副本（非深度复制）
  @param  {object} obj 要克隆的对象
  
  @example
  
  ```js
  var source = {
  key1: {
  key2: 'value2'
  },
  key3: 'value3'
  };
  
  var target = kity.Utils.clone(source);
  
  console.log(target === source); // false
  console.log(target.key1 === source.key1); // true
  console.log(target.key3 === source.key3); // true
  ```