摘要： 正则表达式分组有4种：先给个例子：var parse_url = /^(?:([A-Za-z]+):)?(\/{0,3})([0-9.\-A-Za-z]+)(?::(\d+))?(?:\/([^?#]*))?(?:\?([^#]*))?(?:#(.*))?$/;var url = 'http://piao.qunar.com:80/index.html?keyword=abc#city=beijing';执行parse_url.exec(url)得到["http://piao.qunar.com:80/index.html?keyword=abc#city=beiji 阅读全文