function onBridgeReady() {
    WeixinJSBridge.call('hideOptionMenu');

    if (typeof onBridgeReadyCallback !== 'undefined' && typeof onBridgeReadyCallback === 'function') {
        onBridgeReadyCallback();
    }
}

if (typeof WeixinJSBridge == "undefined") {
    if (document.addEventListener) {
        document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
    } else if (document.attachEvent) {
        document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
        document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
    }
} else {
    onBridgeReady();
}

ios系统未执行函数onBridgeReadyCallback();