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>
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