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dogxiidogxii
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chore: Add some questions
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‎public/questions/algorithm.json‎

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‎public/questions/css.json‎

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‎public/questions/js.json‎

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"source": "高频"
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"question": "var、let、const 有什么区别？",
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"answer": "## var、let、const 的区别\n\n### 1. 作用域\n- `var`：函数作用域，在函数外声明则为全局变量\n- `let`/`const`：块级作用域，只在 `{}` 内有效\n\n### 2. 变量提升\n- `var` 存在变量提升，声明会提升到函数顶部，值为 `undefined`\n- `let`/`const` 存在「暂时性死区（TDZ）」，声明前访问会报 `ReferenceError`\n\n### 3. 重复声明\n- `var` 允许重复声明\n- `let`/`const` 不允许在

‎public/questions/network.json‎

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‎public/questions/perf.json‎

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‎public/questions/perf.json.bak_20260309_002133‎

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‎public/questions/performance.json‎

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‎public/questions/typescript.json‎

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