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The JavaScript function does not do any checking on the value of the parameter.

Function explicit parameters (Parameters) and implicit parameters (Arguments)

Explicit arguments to the function:

FunctionName (parameter1,parameter2,parameter3) {

/ / the code to be executed.

}

The function explicit parameters are listed when the function is defined.

The function implicit parameter is passed to the real value of the function when the function is called.

Parameter rule

The JavaScript function does not specify a data type when defining explicit parameters.

The JavaScript function does not type-check implicit parameters.

The JavaScript function does not detect the number of implicit parameters.

Default parameter

In ES5, if the implicit parameter is not provided when the function is called, the parameter will be set to: undefined by default.

Sometimes this is acceptable, but it is recommended that you set a default value for the parameter:

Instance (ES5)

Function myFunction (XBI y) {

If (y===undefined) {

Yellow0

}

}

Or, in a simpler way:

Instance (ES5)

Function myFunction (XBI y) {

Yellowy | | 0

}

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