Basic Javascript tutorial-Definition and function call-basics-js tutorial

This article mainly introduces the definition of the basic Javascript tutorial and relevant information about calling functions. For more information, see the function as a statement that can be run at any time. To put it simply, A function is a set of statements used to complete a function. It accepts 0 or multiple parameters.

Basic Function syntaxAs follows:

The Code is as follows:

Function functionName ([arg0, arg1,... argN]) {
Statement
[Return [expression]
}

Function is the keyword of the custom function, functionName is the function name, arg indicates the list of parameters passed to the function, and each parameter is separated by a comma. The parameter can be null.

Statement is a function of this province. It can be a variety of valid code blocks.

Reture expression is the return function value expression, which is also optional. A simple example is as follows.

The Code is as follows:

Function sayName (yname ){
Document. write ("hello" + yname)
}
SayName (1, 112 );

In addition, javascript will not be executed after rerurn is executed.

The Code is as follows: