javascript 取URL中的参数

  var getParameter = function(name){
  var rtnval = '';
  var nowAddress = unescape(location.href);
  var parameters = (nowAddress.slice(nowAddress.indexOf('?')+1,nowAddress.length)).split('&');
  for(var i=0; i<parameters.length; i++){
    var varName = parameters[i].split('=')[0];
    if(varName.toUpperCase() == name.toUpperCase()){
      rtnval = parameters[i].split('=')[1];
      break;
    }
  }
  return rtnval;
}