表单对象赋值

/**
 * 表单对象赋值:
 * 对目标对象存在且源对象同样存在的属性，全部覆盖；
 * 目标对象不存在但是源对象存在的属性， 全部丢弃；
 * 目标对象存在但是源对象不存在的属性，如果是字符串赋值为空串，其余类型赋值为undefined
 */
export function recover (target, source) {
  if (target === undefined || target === null) { throw new TypeError('Cannot convert first argument to object') }
  var to = Object(target)
  if (source === undefined || source === null) { return to }
  var keysArray = Object.keys(Object(target))
  for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
    var nextKey = keysArray[nextIndex]
    var desc = Object.getOwnPropertyDescriptor(target, nextKey)
    if (desc !== undefined && desc.enumerable) {
      if (to.hasOwnProperty(nextKey)) {
        if (to[nextKey] instanceof Array) {
          to[nextKey] = source[nextKey]
        } else if (to[nextKey] instanceof Object) {
          recover(to[nextKey], source[nextKey])
        } else if (source[nextKey] !== undefined) {
          to[nextKey] = source[nextKey]
        } else if (typeof (to[nextKey]) === 'string') {
          to[nextKey] = ''
        } else {
          to[nextKey] = undefined
        }
      }
    }
  }
  return to
}

/**
 * 表单对象赋值:
 * 对目标对象存在且源对象同样存在的属性，全部覆盖；
 * 目标对象不存在但是源对象存在的属性， 全部丢弃；
 * 目标对象存在但是源对象不存在的属性，保留目标对象的属性不做处理
 */
export function recoverNotNull (target, source) {
  if (target === undefined || target === null) { throw new TypeError('Cannot convert first argument to object') }
  var to = Object(target)
  if (source === undefined || source === null) { return to }
  var keysArray = Object.keys(Object(target))
  for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
    var nextKey = keysArray[nextIndex]
    var desc = Object.getOwnPropertyDescriptor(target, nextKey)
    if (desc !== undefined && desc.enumerable) {
      if (to.hasOwnProperty(nextKey)) {
        if (to[nextKey] instanceof Array) {
          to[nextKey] = source[nextKey]
        } else if (to[nextKey] instanceof Object) {
          recover(to[nextKey], source[nextKey])
        } else if (source[nextKey] !== undefined) {
          to[nextKey] = source[nextKey]
        }
      }
    }
  }
  return to
}