How to understand the global scope of JavaScript

How to understand JavaScript global scope, many novices are not very clear about this, in order to help you solve this problem, the following small series will explain in detail for everyone, people who have this need can learn, I hope you can gain something.

Variables defined in global scope can be accessed anywhere.

Variables defined outside the outermost defined function and outside the outermost defined function have global scope.

Imply global is an undeclared variable assigned directly.

examples

function func() { implyGlobalVar = 'global'; var localVar = 'local'}func() //execute console.log(implyGlobalVar) // globalconsole.log(localVar) // localVar is not defined Did reading the above help you? If you still want to have further understanding of related knowledge or read more related articles, please pay attention to the industry information channel, thank you for your support.