function getOpenId(){
	var wxopenid=getcookie('wxopenid');  
	if(wxopenid ==''){
	    var access_code=getQueryStringByName('code');  
	    if (access_code==undefined || access_code=='')  
	    {     
	        var fromurl=location.href;  
	        var url='https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxaf5a9e02cc14e220&redirect_uri='+encodeURIComponent(fromurl)+'&response_type=code&scope=snsapi_base&state=STATE%23wechat_redirect&connect_redirect=1#wechat_redirect';  
	        location.href=url;  
	    }  
	    else  
	    {     
	    	var result="";
	    	 $.ajax({  
	             type:'get',  
	             url:'http://vip.chongaibao.com/wx/pay/getOpenId.php?code='+access_code,  //php接口 
	             async:false,  
	             cache:false, 
	             dataType:'text',  
	             success:function(openId){
	            	 result = openId;
                 },
                 error:function(request,status,error){
                	 //出错了
                 }
             });   
	    	 return result;
	    } 
	}else{
		return wxopenid;
	}

	
}

//根据QueryString参数名称获取值

function getQueryStringByName(name){

     var result = location.search.match(new RegExp("[\?\&]" + name+ "=([^\&]+)","i"));

     if(result == null || result.length < 1){

         return "";

     }

     return result[1];

}


function addcookie(name,value,expireHours){  
    var cookieString=name+"="+escape(value)+"; path=/";  
    //判断是否设置过期时间  
    if(expireHours>0){  
        var date=new Date();  
        date.setTime(date.getTime+expireHours*3600*1000);  
        cookieString=cookieString+"; expire="+date.toGMTString();  
    }  
    document.cookie=cookieString;  
}  
  
function getcookie(name){  
    var strcookie=document.cookie;  
    var arrcookie=strcookie.split("; ");  
    for(var i=0;i<arrcookie.length;i++){  
    var arr=arrcookie[i].split("=");  
    if(arr[0]==name)return decodeURIComponent(arr[1]); //增加对特殊字符的解析  
    }  
    return "";  
}  
  
function delCookie(name){//删除cookie  
    var exp = new Date();  
    exp.setTime(exp.getTime() - 1);  
    var cval=getcookie(name);  
    if(cval!=null) document.cookie= name + "="+cval+"; path=/;expires="+exp.toGMTString();  
}