//隐藏
  document.addEventListener("WeixinJSBridgeReady",
    function onBridgeReady() {
      WeixinJSBridge.call("hideOptionMenu");
    }
  );
  
  // 显示
  document.addEventListener('WeixinJSBridgeReady',
    function onBridgeReady() {
    WeixinJSBridge.call('showOptionMenu');
  });