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                如果要比較的兩個值的任意一個可能是true或false,要避免使用==,而是用=== 如果要比較的兩個值得任意一個可能是0、""、[],要避免使用==,而是用=== 剩下的所有情況使用==都是安全的 NaN既不小于任何值也不大于任何值 ``` "foo" < NaN; //false "foo" > NaN; //false ``` 變量必須由a-zA-Z$_開始,可以包含0-9但不能是開頭
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