startCompassstartCompass解释:开始监听罗盘数据。参数:Object Object参数说明: 参数名类型必填说明successFunction否接口调用成功的回调函数failFunction否接口调用失败的回调函数completeFunction否接口调用结束的回调函数(调用成功、失败都会执行) 示例: swan.startCompass();