下面有一段 JavaScript 程序,其输出结果是( )。 var str = "I am loser, you are loser, all are loser."; var str_new = str.replace("loser", "hero"); document.write(str_new);
A.
I am hero, you are hero, all are hero.
B.
I am "hero", you are "hero", all are "hero".
C.
I am hero, you are loser, all are loser.
D.
I am "hero", you are loser, all are loser.