微信 js sdk 签名错误

获取的signature在 http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign 做了验证通过 但是通过微信访问的时候 老报 invalid signature

我的服务端是nodejs

var access_token = function() {
return function(done) {
var token_url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' + appId + '&secret=' + appSecret
var self = this;
request(token_url, function(error, response, body) {
if (!error && response.statusCode == 200) {
logger.info('access_token');
token = JSON.parse(body).access_token;
}
done();
})
}
}

var get_jsapi_ticket = function() {
return function(done) {
var jsapi_ticket_url = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=' + token + '&type=jsapi';
request(jsapi_ticket_url, function(error, response, body) {
if (!error && response.statusCode == 200) {
logger.info('get_jsapi_ticket');
ticket = JSON.parse(body).ticket;
done();
}
})
}
}

求帮助谢谢~~~~~