function chgTitle(str,len)
{
var strlen = 0; 
var s = "";
for(var i = 0;i < str.length;i++)
{
	if(str.charCodeAt(i) > 128)
		strlen += 2;
	else 
		strlen++;
	s += str.charAt(i);
	if(strlen >= len) 
        return s + "...";
}
return s;
}
//将时间戳转化成yyyy-MM-dd的格式
function formatTime(time)
{
	var date = new Date();
	date.setTime(time*1000);
	return ""+date.getFullYear()+"-"+(date.getMonth()+1)+"-"+date.getDate();
}
//如果图片链接中没有http://增加http://
function dealImgUrl(imgUrl)
{
	if(imgUrl < 7)
	{
		imgUrl = "http://".concat(imgUrl);
		return imgUrl;
	}
	else
	{
		var str = imgUrl.substring(0,7);
		if("http://"==str)
		{
			return imgUrl;
		}
		else
		{
			imgUrl = "http://".concat(imgUrl);
			return imgUrl;
		}
	}
}
//目前只用于处理新店铺的logo，如果需要通用，可以在参数中传入id的前缀
function dealNewStoreShopLogo()
{
	for(var i =0;i<size;i++)
	{
		var img=document.getElementById("newstoreImg"+i);
		var imgUrl=document.getElementById("newstoreImgUrl"+i).value;
		if(imgUrl==null||imgUrl=="default "||imgUrl==" ")
		{
				img.src = ""+server+"/pic/nopic.gif";
		}
		imgUrl = dealImgUrl(imgUrl);
		img.src = imgUrl;
	}
}
//分类搜索中加入_s
function changeImg()
{
	if(size ==null)
	{
		size = 0;
	}
	if(searchFrom==1)
	{
		return;
	}
	else
	{
		for(var j=0;j<size;j++)
		{
			var img = document.getElementById("storeFromImg"+j);
			var url = document.getElementById("storeFromUrl"+j).value;
	
			if(url==null||url=="default "||url==" ")
			{
		 		img.src = ""+server+"/pic/nopic.gif";
			}
			else 
			{
				var strs= url.split(".");
				var newUrl = "";;
				for(var i = 0;i<strs.length;i ++)
				{
					if(i == strs.length-2)
					{
						newUrl += strs[i]+"_s.";
					}
					else if(i == strs.length-1)
					{
						newUrl +=strs[i];
					}
					else
					{
						newUrl+=strs[i]+".";
					}			
				}
				img.src = newUrl;
			}
		}
	}
}