//配置项
var config = {
  /**
   * Option merge strategies (used in core/util/options)//选项合并策略
   */
  optionMergeStrategies: Object.create(null),

  /**
   * Whether to suppress warnings.//是否抑制警告
   */
  silent: false,

  /**
   * Show production mode//生产模式 tip message on boot?//提示信息引导
   */
  productionTip: "development" !== ‘production‘,

  /**
   * Whether to enable devtools//是否启用开发者工具
   */
  devtools: "development" !== ‘production‘,

  /**
   * Whether to record perf//是否记录性能
   */
  performance: "development" !== ‘production‘,

  /**
   * Error handler for watcher errors//错误处理观察错误
   */
  errorHandler: null,

  /**
   * Ignore certain custom elements//忽略某些自定义元素
   */
  ignoredElements: [],

  /**
   * Custom user key aliases for v-on//自定义用户键别名
   */
  keyCodes: Object.create(null),

  /**
   * Check if a tag is reserved so that it cannot be registered as a//检查如果一个标签被保留所以它将不会被注册为一个组件
   * component. This is platform-dependent and may be overwritten.//这是与平台相关的可能被覆盖
   */
  isReservedTag: no,

  /**
   * Check if a tag is an unknown element.检查一个标签是否是未知的元素
   * Platform-dependent.//平台相关
   */
  isUnknownElement: no,

  /**
   * Get the namespace of an element//得到一个元素的命名空间
   */
  getTagNamespace: noop,

  /**
   * Parse the real tag name for the specific platform.//针对特殊的平台解析真正的标签名称
   */
  parsePlatformTagName: identity,

  /**
   * Check if an attribute must be bound using property, e.g. value//检查是否一个属性必须被限制用一个属性
   * Platform-dependent.
   */
  mustUseProp: no,

  /**
   * List of asset types that a component can own.//组件能拥有的资产类型列表
   */
  _assetTypes: [
    ‘component‘,
    ‘directive‘,
    ‘filter‘
  ],

  /**
   * List of lifecycle hooks.//钩子的生命周期
   */
  _lifecycleHooks: [
    ‘beforeCreate‘,
    ‘created‘,
    ‘beforeMount‘,
    ‘mounted‘,
    ‘beforeUpdate‘,
    ‘updated‘,
    ‘beforeDestroy‘,
    ‘destroyed‘,
    ‘activated‘,
    ‘deactivated‘
  ],

  /**
   * Max circular updates allowed in a scheduler flush cycle.最大循环更新允许在一个调度冲洗循环
   */
  _maxUpdateCount: 100
};