修复app推送在线状态错误

‘liusuyi’

2023-07-28 c76d735cf906bde876ebd32a0ad8d1413a7ca902

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export function isPromise(maybePromise) {
    return (!!maybePromise &&
        !!maybePromise.then &&
        typeof maybePromise.then === 'function');
}