/* 创建异步方法 */
function createxhr() {
	if (typeof xmlhttprequest != 'undefined') {
		return new xmlhttprequest();
	} else if (typeof activexobject != 'undefined') {
		var version = [
									'msxml2.xmlhttp.6.0',
									'msxml2.xmlhttp.3.0',
									'msxml2.xmlhttp'
		];
		for (var i = 0; version.length; i ++) {
			try {
				return new activexobject(version[i]);
			} catch (e) {
				//跳过
			}	
		}
	} else {
		throw new error('您的系统或浏览器不支持xhr对象！');
	}
}
//名值对转换为字符串
function paramsjoin(data) {
	var arr = [];
	for (var i in data) {
		arr.push(encodeuricomponent(i) + '=' + encodeuricomponent(data[i]));
	}
	return arr.join('&');
}
//封装ajax
function ajax(obj) {
	var xhr = createxhr();
	obj.url = obj.url + '/rand/' + math.random();
	obj.data = paramsjoin(obj.data);
	if (obj.method === 'get') obj.url += obj.url.indexof('?') == -1 ? '/' + obj.data : '/' + obj.data;
	if (obj.async === true) {
		xhr.onreadystatechange = function () {
			if (xhr.readystate == 4) {
				callback();
			}
		};
	}
	xhr.open(obj.method, obj.url, obj.async);
	if (obj.method === 'post') {
		xhr.setrequestheader('content-type', 'application/x-www-form-urlencoded');
		xhr.send(obj.data);	
	} else {
		xhr.send(null);
	}
	if (obj.async === false) {
		callback();
	}
	function callback() {
		if (xhr.status == 200) {
			obj.success(xhr.responsetext);
		} else {
			alert('获取数据错误！错误代号：' + xhr.status + '，错误信息：' + xhr.statustext,'error');
		}	
	}
}
/* js常用函数 v.0.0.3 */
function g(objname){if(document.getelementbyid){return eval('document.getelementbyid("'+objname+'")')}else{return eval('document.all.'+objname)}} //取得id的对象
function hide(a){
	a = g(a);
	if(!a) return;
	a.style.display = "none";
	a.style.visibility = 'hidden'; 
	return a
}
function bhmovechild(a){a=g(a);if(!a) return;document.body.removechild(a);}
/* 获取物理高度 */
var getheight=function(){
	var f=document,a=f.body,d=f.documentelement,c=f.compatmode=="backcompat"?a:f.documentelement;
	return math.max(d.scrollheight,a.scrollheight,c.clientheight)
};
/* 获取物理宽度 */
var getwidth=function(){
	var f=document,a=f.body,d=f.documentelement,c=f.compatmode=="backcompat"?a:f.documentelement;
	return math.max(d.scrollwidth,a.scrollwidth,c.clientwidth)
};
//影藏遮罩层
function hide(){
 hide('vmask');
 bhmovechild('vmask');
}
/* 创建遮罩层 */
function cmask(){
	thebody=document.body;
	v = document.createelement("div");
	v.id = "vmask";
	v.classname = "cscreen";
	v.style.display = "block";
	v.style.visibility = 'visible';
    v.style.width = getwidth()+"px";
	v.style.height = getheight()+"px";
    thebody.appendchild(v);
}
/* 优化遮罩层 ps:随着屏幕的扩大或者缩小自动铺满 */
window.onresize = function(){
  if(g("vmask")){
    var obj = g("vmask");
	obj.style.width = getwidth() + 'px';
	obj.style.height = getheight() + 'px';
  }
}
/* 滚动 */
function switch_div(wraper,prev,next,img,speed,or){	
	var wraper = $(wraper);
	var prev = $(prev);
	var next = $(next);
	var img = $(img).find('ul');
	var w = img.find('li').outerwidth(true);
	var s = speed;
	next.click(function(){
						 img.animate({'margin-left':-w},function(){
						  	img.find('li').eq(0).appendto(img);
							img.css({'margin-left':0});
						 });
						});
	prev.click(function(){
						  img.find('li:last').prependto(img);
						  img.css({'margin-left':-w});
						  img.animate({'margin-left':0});
						});
	if (or == true){
		ad = setinterval(function() { next.click();},s*1000);
		wraper.hover(function(){clearinterval(ad);},function(){ad = setinterval(function() { next.click();},s*1000);});
	}
}