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JavaScript鍵盤上下鍵控制移動

//通過id獲取mid var mid = document.getElementById("mid"); //給mid設定事件的監聽 window.document.onkeydown = function(ent) { var event = ent || window.event; switch(event.keyCode) { case 37: //左 mid.style.left = Math
.max(0, mid.offsetLeft - 5) + "px"; break; case 38: //上 mid.style.top = Math.max(0, mid.offsetTop - 5) + "px"; break; case 39: //右 mid.style.left = Math.min(350, mid.offsetLeft + 5
) + "px"; break; case 40: //下 mid.style.top = Math.min(350, mid.offsetTop + 5) + "px"; break; } }