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This article mainly introduces how to form a scope chain in JavaScript. The introduction in the article is very detailed and has certain reference value. Interested friends must read it!

When JavaScript functions are executed, they first find the corresponding attribute value in their AO.

2. If you can't find it, you will go to the AO of the parent to find it. When you can't find it, you will go to the parent of the parent to find it until you find the window object. The AO chain formed in this way is the scope chain.

examples

function foo() { function bar() { var inner = 234; outer = 0; console.log(inner); } var outer = 123; bar(); console.log(outer) console.log(glob)}var glob = 100;foo() The above is all the content of "How to form a scope chain in JavaScript", thank you for reading! Hope to share the content to help everyone, more relevant knowledge, welcome to pay attention to the industry information channel!

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