命名空间接口空检查泛型访问修饰符Optional Parameters（可选参数）php复制代码// -- TypeScript -- //...
(5). 可选参数(optional parameters) JavaScript: JS中所有的参数都是可选参数。这可以理解为JS的特性也可以说是设计缺陷,毕竟有时候漏传参数又不报错容易导致各种问题。 Dart: 在Dart中,常规的参数都是必传的,而命名参数和位置参数(positional parameter)都可以是可选参数。当然方法体中需要增加容错逻辑,已防止可...
Optional parameters are great to avoid a mess of conditional clauses at the beginning of your method. To make a parameter optional,declare its type inside of an Array, like this:{name: [String]} example: functionunique(){arguments=__({array:Array,isSorted:[Boolean],iterator:[Function]})/...
This class defines a simple 2-d circle. Parameters: NameTypeDescription centerXfloat Specifies the X coordinate of the center of the circle. centerYfloat Specifies the Y coordinate of the center of the circle. radiusfloat Specifies the radius of the circle. ...
// SQL Query specificationconstquerySpec = {// SQL query text using LIKE keyword and parameterquery:`select * from products p where p.name LIKE @propertyValue`,// Optional SQL parameters, to be used in queryparameters: [ {// name of property to find in query textname:"@propertyValue",...
Parameters: <Node | String> divId Required Container id for the referencing map. Required. <Object> options Optional Optional parameters. See options list. options properties: <Number> attributionWidth Optional Width of the attribution node relative to the map width. The default value is 0.45 ...
静态类型）TypeScript 的优点Language Features（语言特性）Optional Parameters（可选参数）Classes Class...
Parameters ParameterDescription tryCodeRequired. Code block to be tested while executing. errA local reference to the error object. catchCodeOptional. Code block to execute if an error occurs. finallyCodeOptional. Code block to execute regardless of the try result ...
Optional parameters may be specified in the optional third parameter for loginImplicitGrant. This parameter accepts an object with key/value pairs. Supported properties:state - An arbitrary string used to associate a login request with a login response. This value will be provided in the state ...
<Object> optionsOptionalOptional parameters. See options list. optionsproperties: <String> copyrightOptionalDefine attribution information for the layer to be used by the Attribution widget. <Extent> fullExtentOptionalSpecify the full extent of the layer. If no value is specified the default value, ...