How to Use console. log in node. js _ node. js

This article mainly introduces node. console in js. log method usage instructions. This article introduces the console. log method description, syntax, receiving parameters, use instances, and implementation source code. For more information, see Method description:

Print characters to the standard output stream and end with a line break.

Syntax:

The Code is as follows:

Console. log ([data], [...])

Receiving parameters:

Console. log accepts several parameters. If there is only one parameter, the string format of this parameter is output.

If multiple parameters exist, they are output in a format similar to the C language printf () command.

If there is no parameter, only one line break is printed.

Example:

The Code is as follows:

Var count = 1234;
Console. log ('count: % d', count );
// Output result count: 1234;
Console. log ('Hello World ');
// Output result Hello world;
Console. log ('count: % D ');
// Output result count: % d;

Source code:

The Code is as follows:

Console. prototype. log = function (){
This. _ stdout. write (util. format. apply (this, arguments) + '\ n ');
};