Today I made a menu button, moved the mouse to the button, and the function of the drop-down submenu appears. The implementation method is to put the submenu into a div and add a hover function to the menu button. But there is a div under the menu button, which contains an object tag, and the flash animation is placed. When the mouse moves to the menu button, the div of the submenu appears, but is blocked by the object animation and cannot be displayed. I searched online and found that most of the solutions were not very effective. Here is a more feasible and easiest way: add <param name=wmode value=transparent> to the object tag.
This method has limitations: it is in charge of ie8, but Firefox and Google Chrome do not work.