[英]How do I make second div move down and up with the w and s keys on the keyboard?
我遇到的問題是,每次我為w和s字符觸發事件鍵時,它都會登錄到控制台,顯示觸發了w事件鍵,但是div沒有任何反應,因為我希望它上下移動。 我嘗試將代碼結構用作第一個div,但只能獲取console.log(e)。 我如何使其向上或向下移動?
我基本上在div元素和一些js上構建pong。 我得到了第一個要用的槳。 當我嘗試運行相同的代碼但使用keydown功能並使用e.key等於w時。 由於某種原因,顯示控制台記錄了按下w鍵的情況,但它從未移動第二個div。
var playerOne = document.getElementById("playerOnePaddle"); var playerTwo = document.getElementById("playerTwoPaddle"); console.log(playerOne); console.log(playerTwo); window.addEventListener('keydown', function (e) { var y = parseInt(getComputedStyle(playerOne).top); e.preventDefault(); if (e.key === "ArrowUp") { y -= 1; playerOne.style.top = y + "px"; console.log(e); } else if (e.key === "ArrowDown") { y += 1; playerOne.style.top = y + "px"; console.log(e); } }); window.addEventListener('keydown', function (e){ var x = parseInt(getComputedStyle(playerTwo).top); e.preventDefault(); if (e.key === 'w') { x -= 1; playerOne.style.top = x + "px"; console.log(e); } else if (e.key === 's') { x = x + 1; playerOne.style.top = x + "px"; console.log(e); } });
#backBoard { border: 1px solid black; height: 200px; position: relative; width: 400px; } #playerOnePaddle { background: black; border: 1px solid black; height: 50px; position: absolute; top: 0; left: 4px; width: 4px; } #playerTwoPaddle { background: red; border: 1px solid red; height: 50px; position: absolute; top: 0; left: 390px; width: 4px; } #ball { background-color: green; border: 1px solid black; border-radius: 50%; height: 15px; position: absolute; top: 0; left: 50px; width: 15px; }
<div id="backBoard"> <div id="playerOnePaddle"></div> <div id="playerTwoPaddle"></div> <div id="ball"></div> </div>
在第二個keydown回調中,您需要更改playerOne的樣式,將其添加到playerTwo 。
這應該是您所期望的(運行代碼段):
x
和y
每次執行事件函數時都會被重置,因此我將它們移出了回調函數。 playerOne
。 var playerOne = document.getElementById("playerOnePaddle"); var playerTwo = document.getElementById("playerTwoPaddle"); var y = parseInt(getComputedStyle(playerOne).top); var x = parseInt(getComputedStyle(playerTwo).top) window.addEventListener('keydown', function (e) { e.preventDefault(); if (e.key === "ArrowUp") { y -= 1; playerOne.style.top = y+"px"; } else if (e.key === "ArrowDown") { y += 1; playerOne.style.top = y+"px"; } else if (e.key === 'w') { x -= 1; playerTwo.style.top = x+"px"; } else if (e.key === 's') { x = x + 1; playerTwo.style.top = x+"px"; } });
#backBoard { border: 1px solid black; height: 200px; position: relative; width: 400px; } #playerOnePaddle { background: black; border: 1px solid black; height: 50px; position: absolute; top: 0; left: 4px; width: 4px; } #playerTwoPaddle { background: red; border: 1px solid red; height: 50px; position: absolute; top: 0; left: 390px; width: 4px; } #ball { background-color: green; border: 1px solid black; border-radius: 50%; height: 15px; position: absolute; top: 0; left: 50px; width: 15px; }
<div id="backBoard"> <div id="playerOnePaddle"></div> <div id="playerTwoPaddle"></div> <div id="ball"></div> </div>
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