创建一个含有方块的面板，用户可以通过鼠标抓取方块，但是，无论用户怎样努力，方块总是朝着与鼠标运动相反的方向运动，这就是抓不住的方块。-Create a panel containing box, the user can crawl through the mouse box, However, no matter how hard we try, the box is always moving in the opposite direction of movement and mouse movement, which is to focus on live box.