How It Works

The mouse button test tool detects the working status of each mouse button by listening to mousedown, mouseup, and wheel events. The left button corresponds to event.button=0, the right button to event.button=2, and the middle button (scroll wheel) to event.button=1. The counter increments when a button is pressed and triggers visual feedback when released. The tool also supports scroll wheel detection (deltaY>0 for scroll down, deltaY<0 for scroll up), recording the number of scroll up and scroll down actions in real time. By highlighting currently pressed buttons on a visual mouse graphic, users can intuitively determine whether mouse buttons are responding normally and detect issues like double-click or no response.