common.js

城市分类信息,门户网站,我做为地方信息网

var userAgent = navigator.userAgent.toLowerCase();
var is_opera  = (userAgent.indexOf('opera') != -1);
var is_saf    = ((userAgent.indexOf('applewebkit') != -1) || (navigator.vendor == "Apple Computer, Inc."));
var is_webtv  = (userAgent.indexOf('webtv') != -1);
var is_ie     = ((userAgent.indexOf('msie') != -1) && (!is_opera) && (!is_saf) && (!is_webtv));

//alert(is_ie);
function InitAjax()
{
    var http_request = false;

    if (window.XMLHttpRequest)
    {
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType)
        {
            http_request.overrideMimeType('text/xml');
        }
    }
    else if (window.ActiveXObject)
    {
        try
        {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e)
        {
            try
            {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e)
            {}
        }
    }
    if (!http_request)
    {
        alert('Giving up :( Cannot create an XMLHTTP instance');
        return false;
    }
    return http_request;
}

function runAjax(url, postStr, method, obj)
{
	var ajax = InitAjax();

	ajax.open(method, url, true);
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajax.send(postStr);
	ajax.onreadystatechange = function()
	{
		if (ajax.readyState == 4 && ajax.status == 200) {
			$(obj).innerHTML = ajax.responseText;
		} else {
			//$(obj).innerHTML = 'Ajax提交失败';
		}
	}	
}

function gotoUrl(url, msg, target)
{
    if ('' != msg)
    {
        if(confirm(msg))
        {
            if (target)
            {
                window.open(url, target);
            }
            else
            {
                window.location = url;
            }
            return false;
        }
    }
    else
    {
        if (target)
        {
            window.open(url, target);
        }
        else
        {
            window.location = url;
        }
        return false;
    }
}


function $()
{
    var elements = new Array();
    for (var i = 0; i < arguments.length; i++)
    {
        var element = arguments[i];
        if (typeof element == 'string')
            element = document.getElementById(element);
        if (arguments.length == 1)
            return element;
        elements.push(element);
    }
    return elements;
}

function trim(text)
{
 text = text.replace(/^ +/,""); 
 text = text.replace(/ +$/,""); 
 return text;
}

function getCookieVal(offset) {
  var endstr = document.cookie.indexOf(";",offset);
  if(endstr == -1)
    endstr = document.cookie.length;
  return unescape(unescape(document.cookie.substring(offset,endstr)));
}
function getusercookie(name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  
  while(i < clen) {
    var j = i + alen;
    if(document.cookie.substring(i,j) == arg)
      return getCookieVal(j);
    i = document.cookie.indexOf(" ",i) + 1;
    if(i == 0) break;
  }
  return null;
}