//方式一,最簡單常用的方式
var rep=url.replace(reg,"$1ShowBook.aspx?bookId=$2&chapterId=$3");
alert(rep);

//方式二 ,采用固定參數(shù)的回調(diào)函數(shù)
var rep2=url.replace(reg,function(m,p1,p2,p3){return p1+"ShowBook.aspx?bookId="+p3+"&chapterId="+p3});
alert(rep2);

//方式三，采用非固定參數(shù)的回調(diào)函數(shù)
var rep3=url.replace(reg,function(){var args=arguments; return args[1]+"ShowBook.aspx?bookId="+args[2]+"&chapterId="+args[3];});
alert(rep3);

//方法四
//方式四和方法三很類似, 除了返回替換后的字符串外，還可以單獨(dú)獲取參數(shù)

[code]
var bookId;
var chapterId;
function capText()
{
    var args=arguments;
    bookId=args[2];
    chapterId=args[3];
    return args[1]+"ShowBook.aspx?bookId="+args[2]+"&chapterId="+args[3];
}

var rep4=url.replace(reg,capText);
alert(rep4);
alert(bookId);
alert(chapterId);

//除了使用replace方法獲取正則表示式的分組外，還可以使用test ,exec方法獲取分組，只是手法有所不同而已
var reg2=new RegExp("(http://www.qidian.com/BookReader/)(\\d+),(\\d+).aspx","gmi");
var m=reg2.exec("http://www.qidian.com/BookReader/1017141,20361055.aspx");
var s="";
//獲取所有的分組
for (i = 0; i < m.length; i++) {
      s = s + m[i] + "\n";     
      }
alert(s);

bookId=m[2];
chapterId=m[3];
alert(bookId);
alert(chapterId);

//使用test方法獲取分組
var reg3=new RegExp("(http://www.qidian.com/BookReader/)(\\d+),(\\d+).aspx","gmi");
reg3.test("http://www.qidian.com/BookReader/1017141,20361055.aspx");
//獲取三個(gè)分組
alert(RegExp.$1);
alert(RegExp.$2);
alert(RegExp.$3);

    var str="www.baidu.com";
        //str.format("好","q")       
        str.replace(new RegExp("(\\.)(bai)du","g"),function(){           
            for(var i=0;i<arguments.length;i++)
            {
                    document.write(arguments[i]+"<br/>");
            }
            document.write("-------------------------------------------------<br/>");
        });