window.console.log()和console .log()有区别吗？体现在哪里？

In a browser environment, window.console.log() and console.log() are functionally equivalent. There's no practical difference in how they behave. Here's why:

• console is a property of the window object: In web browsers, the global object is window. The console object is a property of this global object. Therefore, referencing console directly is implicitly the same as referencing window.console.

• Global scope resolution: When you use console.log(), the JavaScript engine automatically resolves console within the global scope (which is window in browsers). It finds window.console and executes the log() method.

In summary: While you can use window.console.log(), it's redundant. console.log() is shorter, more common, and does the exact same thing. There's no performance difference or change in behavior.

Where it might matter (but very rarely):

1. Other Environments: While irrelevant for typical browser development, in some other JavaScript environments (like certain server-side JavaScript runtimes), the global object might not be window. In those cases, console might not be directly available, and you might need to access it through a different global object or require it as a module.

2. Overriding console: In extremely rare scenarios, if you've intentionally or accidentally overridden the console variable in your code within a specific scope, using window.console.log() would bypass the overridden variable and access the original console object attached to the window. This is highly unlikely to be a practical concern in normal development.

3. with statement (deprecated): The with statement (generally discouraged) can create situations where the resolution of console might be ambiguous. It's best to avoid with altogether.

So, stick with console.log(). It's the standard and preferred way to use the console.