Named parameters have two main benefits: they provide descriptions for arguments in function calls and they work well for optional parameters. I’ll first explain the benefits and then show you how to simulate named parameters in JavaScript via object literals. Named Parameters as Descriptions As so...
首先是一个 function 关键字后面跟着一个空格,之后是一个自选的标识符(identifier)用以说明你的函数;之后跟着的是以逗号分割的形参(formal parameters)列表,该形参列表处于一对圆括号中,这些形参会在函数内部转变为可用的局部变量;最后是一个自选的函数体(funciton body),在这里面你可以书写声明和表达式。请注意下面的...
y);// calling function `foo` with parameters `x` and `y`obj.bar(3);// calling method `bar` of object `obj`// A conditional statementif(x===0){// Is `x` equal to zero?x=123;}// Defining function `baz` with parameters `a` and ...
In the preceding example, the variable name dotNetHelper is arbitrary and can be changed to any preferred name.For the following component:The component has a JS-invokable .NET method named GetHelloMessage. When the Trigger .NET instance method button is selected, the JS function sayHello1 is ...
> jane.name // get property `name` 'Jane' > jane.describe // get property `describe` [Function] 获取不存在的属性返回undefined: > jane.unknownProperty undefined 调用方法 点运算符也用于调用方法: > jane.describe() // call method `describe` 'Person named Jane' 设置属性 您可以使用赋值运算符...
Parameter name inlay hintsshow the names of parameters in function calls: This can help you understand the meaning of each argument at a glance, which is especially helpful for functions that take Boolean flags or have parameters that are easy to mix up. ...
Objects referenced from anywhere in the currentcall stack(that is, all local variables and parameters in the functions currently being invoked, and all the variables in the closure scope) Allglobalvariables Objects are kept in memory at least as long as they are accessible from any of the roots...
arguments 是你输入的值(实参), parameters 是函数中的命名变量(形参),用于接收函数的输入值。例子如下: function foo(x,y) { // .. } var a = 3; foo( a, a * 2 ); a和 a * 2(即为 6)是函数 foo(..) 调用的 arguments。x 和 y 是 parameters,用于接收参数值(分别为 3 和 6 )。 注意...
If true, the values in the result will not be formatted i.e. IdentifyParameters returnZ Boolean When true, indicates that z-values will be returned. IdentifyParameters spatialReference SpatialReference|null|undefined The spatial reference of the input and output geometries as well as of the mapExte...
customParameters Object|null|undefined A list of custom parameters appended to the URL of all resources fetched by the layer. MapImageLayer dateFieldsTimeZone String|null|undefined The time zone that dates are stored in. MapImageLayer datesInUnknownTimezone Boolean This property is set by the ser...