为什么console.log（）polyfill不使用Function.apply（）？

Question

I've been looking at some of the popular console.log() wrappers/polyfills:

• Paul Irish's
• Ben Alman's
• Craig Patik's

I notice that all of them accept multiple arguments , but they all do something like this:

console.log(arguments);

Which results in output like this (in Chrome):

Whereas, at least in a modern browser like Chrome or Firefox, console.log() also accepts multiple arguments, so that this would produce (IMHO) superior output:

console.log.apply(console, arguments)

Which results in output like this (in Chrome):

Is there any particular reason why I should avoid using console.log.apply() with multiple arguments? Or this this just a matter of taste or saving bytes?

Answer 1

I would personally suggest that you only use .apply() when you have to: .apply() is the only way to pass an array as the arguments of a function. If you don't need to pass an array, then just use console.log() . It is less verbose and it is a direct invocation.

Answer 2

Please note that apply takes an array of arguments!

So calling console.log(args) have to be console.log.apply(console, [args]) , not console.log.apply(console, args) to behave equal - in your example each item in array becomes his very own argument in apply.

On the other hand you may also call console.log("foo", "bar", $("body"))