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This article mainly introduces the effect of moving elements up, down, left and right with JS in detail. It has a certain reference value. Interested friends can refer to it. I hope it can help everyone.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> a { cursor: pointer; } #cell { width: 30px; height: 30px; background: red; position: relative; left: 0; top: 0; } </style> </head> <body onload="move()"> <p>友情提示:请按键盘上的上下左右键</p> <p id="cell"></p> <script> function move() { var a = document.getElementById("cell"); a.style.left = 0; a.style.top = 0; document.onkeydown = function(e) { var e = window.event ? window.event : e; if(e.keyCode == 38) { //up a.style.top = parseInt(a.style.top) - 50 + 'px'; //注意要用parseInt 因为a.style.top类型是字符串 } if(e.keyCode == 40) { //down a.style.top = parseInt(a.style.top) + 50 + 'px'; } if(e.keyCode == 37) { //left a.style.left = parseInt(a.style.left) - 50 + 'px'; } if(e.keyCode == 39) { //right a.style.left = parseInt(a.style.left) + 50 + 'px'; } } } </script> </body> </html>
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