如何使变量在 JavaScript 中的 scope 之外可访问

Question

I am new to JavaScript and learning about scope. I understand that there is Global Scope and Local Scope, but wanted to know if variables in the Local scope could be made available outside their scope.

Is this possible, and if so how?

Thank you to everyone with the quick responses.

I'm learning to program and I had an outline made up on topics to research from a programmer. They said there is a way and even though it is bad practice, this could be used as a developer tool and there are some scenarios this would be helpful in.

Answer 1

You can assign them to globalThis (also known as window in the browser and global in node):

 function assignGlobal(x) { globalThis.globalVar = x; } console.log(globalThis.globalVar); assignGlobal('foo'); console.log(globalThis.globalVar);

WARNING: This is generally considered bad practice. It is usually easy to restructure your code in a way that you don't need to assign to the global scope ever.

For debugging you can often call console.log(myObject) and inspect it in your developer console ( f12 in chrome; Ctrl + Shift + k in firefox). You can then right click the output and select something like “Store as global variable”:

• Right Click → Save as global variable