標籤：style blog http color 2014 io
廢話不多說，上代碼：
案例1
<!doctype html><html><head><meta charset="utf-8"><title>Test</title><script> function a() { var flag = true; b(); } function b() { console.log( flag ); } a(); </script></head><body></body></html>
輸出結果的如下：
期望值是：true，但是結結果很悲劇。
案例2
<!doctype html><html><head><meta charset="utf-8"><title>Test</title><script> function a() { var flag = true; function b() { console.log( flag ); } b(); } a(); </script></head><body></body></html>
輸出結果的如下：
變化：
把函數b的定義放到了函數a的內部定義，輸出結果終於如願了。
綜述：
函數的範圍是由函數定義時所決定的。
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