var text = "mom and dad and baby";var pattern = /mom( and dad( and baby)?)?/gi;var matches = pattern.exec(text);alert(matches.index); // 0alert(matches.input); // "mom and dad and baby"alert(matches[0]); // "mom and dad and baby"alert(matches[1]); // " and dad and baby"aler t(matches[2]); // " and baby"
下面pattern中的問號和括號有特殊作用嗎？不太懂
yuqingzhijie3596863
2016-11-11 10:15:29
