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:
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:
var count = 1234;
console.error('count: %d', count);
Source code:
Console.prototype.warn = function() {
This._stderr.write(util.format.apply(this, arguments) 'n');
};

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