code: function deepClone(target, src) {
    target = target || {};
    Object.keys(src).forEach(key => {
      if (typeof target[key] !== 'object' || Array.isArray(target[key])) {
        target[key] = src[key];
      } else {
        target[key] = _lodash2.default.defaultsDeep({}, src[key], target[key]);
      }
    });
    return target;
  }
docs: 深度克隆对象
  @param {Object} target 目标对象
  @param {Object} src 原始对象
  @returns {Object}