vara=10;functionexample(){alert(a);vara=5;}example();执行,以下结果错误的是()。A、undefinedB、报错C、10D、5
vara=10;functionexample(){alert(a);vara=5;}example();执行,以下结果错误的是()。
- A、undefined
- B、报错
- C、10
- D、5
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