如何使过滤器链选项选择到Google Map

Question

我有两个功能来过滤标记到Google Map，并且我想将两个过滤器链接起来以获得结果。

如何使用当前当前的代码执行此操作？

// filter markers by category
filterMarkers = function(category) {
  for (i = 0; i < gmarkers1.length; i++) {
    marker = gmarkers1[i];
    // If is same category or category not picked
    if (marker.category == category || category.length === 0) {
      marker.setVisible(true);

    }
    // categories don't match 
    else {
      marker.setVisible(false);
    }
  }
}

// filter markers by session
filterMarkersx = function(session) {
  for (i = 0; i < gmarkers1.length; i++) {
    marker = gmarkers1[i];
    // If is same session or session not picked
    if (marker.session == session || session.length === 0) {

      marker.setVisible(true);


    }
    // session don't match 
    else {
      marker.setVisible(false);
    }
  }
}