Uncaught TypeError:Cannot call method 'startListener' of undefined at

Ginfo

var gravitySensor = api.require('gravitySensor');
gravitySensor.startListener({type:3},function(ret, err){
                api.alert("可获取状态:"+ret.state+"x轴:"+ret.x+"y轴:"+ret.y+"z轴:"+ret.z);
});
为什么提示 Uncaught TypeError:Cannot call method 'startListener' of undefined at page.html

技术支持-M

云编译，添加gravitySensor模块

技术咨询-Kenny

检查下gravitySensor这个模块是否在网站上面添加上了