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Jack Chen
繁体字看的不太习惯^__^
打印10 ``` var b = 10; (function b(){ b = 20; console.log(window.b);//10 })(); ``` 打印20 ``` var b = 10; (function b(){ var b = 20; console.log(b);//20 })(); ```
最简单的将var改成let ```javascript for (let i = 0; i< 10; i++){ setTimeout(() => { console.log(i); }, 1000) } ```