IE 左键是 window.event.button = 1 右键是 window.event.button = 2 中键是 window.event.button = 4 没有按键动作window.event.button = 0 Firefox 左键是 event.button = 0 右键是 event.button = 2 中键是 event.button = 1 没有按键动作 event.button = 0 Opera 7.23/7.54 鼠标左键是 window.event.button = 1 没有按键动作 window.event.button = 1 右键和中键无法获取 O
