微信开发：已经授权的用户二次登陆静默验证openid

	function getQueryString(name) {
            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
            var r = window.location.search.substr(1).match(reg);
            if (r != null) return unescape(r[2]); return null;
        }

        var code = getQueryString("code");

            if(!code) {
                var url = encodeURIComponent(window.location.href);
                location.href = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx5d4fb5f6e0c802fb&redirect_uri=" + url + "&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect";
                code = getQueryString("code");
            }

            if(code)getUser(code);

        //静默获取openid，
        function getUser(code){
            var html = '';
            
            $.ajax({
                url:"data/get_openid.php?code="+code,
                success:function(data){
 
                
                    html = `
                        
"background-color:#fff;">
                            
昵称：
                            ${data.nickname}
                        
                        
"background-color:#fff;">
                            
城市：
                            ${data.city}
                        
                    `;
                    headerImg = `
                        class="header_span">"${data.headerImgUrl}" alt=""/>
                    `;

                    $("#userInfoUL").html(html);
   

                },
                error:function(res){
                    
                }
            });//end of ajax
        }