网页在IE 11版本无法正常运行问题排查求助

Hey there, let's tackle this IE11 headache together! You've already ruled out includes() by switching to indexOf(), so let's look at the other suspects you mentioned—and some easy-to-miss IE11 gotchas:

Common IE11 JS Feature Limitations to Check #

• Arrow Functions: IE11 has zero support for () => {} syntax. If your code uses these anywhere, replace them with traditional function() declarations. This is one of the most frequent culprits for IE11 breakage.
• let/const Scoping Bugs: While IE11 claims to support let and const, it has weird bugs with block scoping (like in for loops where the variable reference doesn't reset per iteration). Try temporarily swapping all let with var to see if that fixes things.
• Other Unsupported Array Methods: Beyond includes(), IE11 doesn't support find(), findIndex(), flat(), or flatMap(). If you're using these, you'll need to polyfill them or rewrite the logic (e.g., replace array.find(item => ...) with array.filter(item => ...)[0]).
• ES6+ Syntax: Template literals (`Hello ${name}`), destructuring assignments (const {a, b} = obj), and Promise/fetch are all no-gos in IE11. Check for these and either rewrite or add polyfills (like es6-promise for promises).

Quick Debugging Step You Should Do First #

Open IE11's Developer Tools (press F12), go to the Console tab, and look for error messages. IE11 will usually tell you exactly which line has an unsupported feature—this is the fastest way to pinpoint the problem.

If you can share your webpage link or specific code snippets that you suspect are causing issues, I can help narrow it down even further!

内容的提问来源于stack exchange，提问作者Tom