How to get Parameters from URL in a Client Script ServiceNow

function onLoad() {
       //Use the 'getURLParam' function below to get the parameter values from the URL
   var id = getURLParam('sysparm_id');
   var description = getParmVal('sysparm_description');
   if(id){
      g_form.setValue('id',id);
   }
   if(description){
      g_form.setValue('my_description_variable',description);
   }
}
 For Native View
 function getURLParam(name){
    var url = document.URL.parseQuery();
    if(url[name]){
        return decodeURI(url[name]);
    }
    else{
        return;
    }
}
 For ServicePortal
 function getURLParam(name) {  
    name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");  
    var regexS = "[\\?&]" + name + "=([^&#]*)";  
    var regex = new RegExp(regexS);  
    var results = regex.exec(top.location);  
    if (results == null) {  
        return "";  
    } else {  
        return unescape(results[1]);  
    }  
}