用javascript获取地址栏参数

方法一：
< script  type ="text/javascript" >
<!--
function  Request(strName){
  var  strHref  = " www.cnlei.org/index.htm?a=aaa&b=bbb&c=ccc " ;
  var  intPos  =  strHref.indexOf( " ? " );
  var  strRight  =  strHref.substr(intPos  +   1 );
  var  arrTmp  =  strRight.split( " & " );
  for ( var  i  =   0 ; i  <  arrTmp.length; i ++ ) {
  var  arrTemp  =  arrTmp[i].split( " = " );
  if (arrTemp[ 0 ].toUpperCase()  == strName.toUpperCase())  return  arrTemp[ 1 ];
 }
  return   "" ;
}

alert(Request( " a " ));
alert(Request( " b " ));
alert(Request( " c " ));
// -->
</ script >

方法二：
< script  type ="text/javascript" >
<!--
String.prototype.getQuery  =   function (name) {
var  reg  =   new  RegExp( " (^|&) " +  name + " =([^&]*)(&|$) " );
var  r  =   this .substr( this .indexOf( " \? " ) + 1 ).match(reg);
if  (r != null )  return  unescape(r[ 2 ]);  return   null ;
}
var  strHref  = " www.cnlei.org/index.htm?a=aaa&b=bbb&c=ccc " ;
alert(strHref.getQuery( " a " ));
alert(strHref.getQuery( " b " ));
alert(strHref.getQuery( " c " ));
// -->
</ script >

方法三：
< script  type ="text/javascript" >
function  getUrlPara(paraName){
 varsUrl   =   location.href;
 varsReg   =    " (?:\\?|&){1} " + paraName + " =([^&]*) "
  var  re = new  RegExp(sReg, " gi " );
 re.exec(sUrl);
  return  RegExp.$ 1 ;
}

// 应用实例：test_para.html?a=11&b=22&c=33
alert(getUrlPara( " a " ));
alert(getUrlPara( " b " ));
</ script >