Instructions for using the console.warn method in node.js_node.js

Method description:

This method is the same as console.error(). If you look at the source code, you will know that console.error actually directly calls console.warn

Grammar:

Copy code The code is as follows:

console.warn([data], [...])

Receive parameters:

console.log accepts several parameters. If there is only one parameter, the string form of this parameter will be output.

If there are multiple parameters, it will be output in a format similar to the C language printf() command.

If there are no parameters, just print a newline character

Example:

Copy code The code is as follows:

var count = 1234;
console.error('count: %d', count);

Source code:

Copy code The code is as follows:

Console.prototype.warn = function() {
This._stderr.write(util.format.apply(this, arguments) 'n');
};