js獲取地址欄具體下標的值

function getParam(paramName){

  paramValue ="";
  isFound =false;
  if (this.location.search.indexOf("?") ==0&&this.location.search.indexOf("=")>1){
    arrSource = unescape(this.location.search).substring(1,this.location.search.length).split("&");
    i =0;
    while (i < arrSource.length &&!isFound){
      if (arrSource[i].indexOf("=") >0){
        if (arrSource[i].split("=")[0].toLowerCase()==paramName.toLowerCase()){
          paramValue = arrSource[i].split("=")[1];
          isFound =true;
        }
      }
    i++;
    }
  }
  //alert(paramValue);

}

//==================================================

getParam("id");