函數調用由一個任意的主題表達式，后跟要給開口的圓括號，逗號分隔表達式作為參數，以閉口的圓括號結束。 > Functions calls consist of an arbitrary subject expression followed by an opening parenthesis (, a comma , separated list of expressions as arguments and a closing parenthesis ). ~~~ subject(); // call with no arguments subject(e1); // call with one argument subject(e1, e2); // call with two arguments // call with multiple arguments subject(e1, ..., eN); ~~~