助手

¥Helpers

options 参数

¥The options-parameter

除了辅助程序调用中使用的参数之外，还会将 options 对象作为附加参数传递给辅助程序。

¥In addition to the parameters used in the helper-call, an options-object is passed to the helper as additional parameter.

• lookupProperty(object, propertyName)：返回对象的 "自有属性" 的函数。此功能遵循 allowedProtoProperties 和 allowedProtoMethods 中指定的白名单。示例：

  ¥lookupProperty(object, propertyName): a function that returns an "own property" of an object. Whitelists specified in allowedProtoProperties and allowedProtoMethods are respected by this function. Example:

  preparationScript

  Handlebars.registerHelper('lookupOrDefault', function (object, propertyName, defaultValue, options) {
      var result = options.lookupProperty(object, propertyName)
      if (result != null) {
          return result
      }
      return defaultValue
  })
  

• 待办事项：描述传递给助手的所有选项

  ¥TODO: Describe all options that are passed to helpers