js获得地址栏参数,实现getParameter(),getParameterValues() 方法

//js构建HashMap function HashMap(key,value){    var key;    var value;    this.put = function(key,value){    this.key = key;    this.value = value;  }  this.getKey = function(){  return key;  }  this.getValue = function(){   return value;  } } //构建简单对象  function Request(){  var parameters = null;  this.init = function(){    var location = window.location.href;    var index = location.indexOf("?");    var queryString = ((index>0)?location.substring(index+1):null);    if(null!=queryString){       parameters = new Array();       var parameterArray = queryString.split("&");       var length = parameterArray.length;       for(var i=0;i<length;i++){       var parameter = parameterArray[i];       index =  parameter.indexOf("=");       var key = parameter.substring(0,index);       var value = parameter.substring(index+1);       if(null!=key && key.length>0){         parameters.push(new HashMap(key,value));      }     }    }  }  this.getParameter = function(key){  this.init();  if(null==parameters)    return "";  var length = parameters.length;  for(var i=0;i<length;i++){     hashMap = parameters[i];     if(hashMap.getKey() == key){       return hashMap.getValue();     }   }   return ""; }  this.getParameterValues = function(key){  this.init();  if(null==parameters)    return null;  var array = new Array();  var length = parameters.length;  for(var i=0;i<length;i++){      hashMap = parameters[i];      if(hashMap.getKey() == key){        array.push(hashMap.getValue());     }  }  return array;  } }//用法 new Request().getParameter(key) 返回stringnew Request().getParameterValues(key) 返回array