Since typeof is a compiler extension, there is not really a definition for it, but in the tradition of C it would be an operator, ... ... <看更多>

'undefined' ? a : void 0, typeof b !== 'undefined' ? b : void 0, typeof c !== 'undefined' ? c : void 0 ). versus. f( a, b, c ). for up to five arguments. ... <看更多>

C ++11下有typeof和auto关键字，于是像上面第3行那样纠结的位置可以变得简单不少：. std::vector<int> arr; // ... for(auto iter = arr.begin(); iter ... ... <看更多>