用JS写一个可以用键盘方向键控制的动画：
效果如下：
好了，代码如下：
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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> body { overflow: hidden } img { position: absolute; top: 0; left: 10px; width: 100px; height: 82px } .right { transform: rotateY(180deg) } .top { transform: rotateZ(45deg) } .bottom { transform: rotateZ(-45deg) } </style></head><body> <img src="./img//Blue ocean11.png" alt="" class="move-background"> <script> var oImg = document.querySelector("img"); /* 思路： */ /* 监听键盘的事件(<- -> 上 下) */ document.onkeydown = function(e) { e = e || window.event; var code = e.which || e.keyCode; var offset = 10; switch (code) { case 37: console.log("left"); console.log('innerWidth',innerWidth,oImg.offsetLeft); oImg.className = ""; var left = oImg.offsetLeft - offset; if (left <= -oImg.offsetWidth) { left = window.innerWidth; } oImg.style.left = left + "px"; break; case 38: console.log("top"); oImg.className = "top"; var top = oImg.offsetTop - offset; if (top <= -oImg.offsetHeight) { top = window.innerHeight; } oImg.style.top = top + "px"; break; case 39: console.log("right"); oImg.className = "right"; var left = oImg.offsetLeft + offset; if (left >= window.innerWidth) { left = -oImg.offsetWidth; } oImg.style.left = left + "px"; break; case 40: console.log("bottom"); oImg.className = "bottom"; var top = oImg.offsetTop + offset; if (top >= window.innerHeight) { top = -oImg.offsetHeight; } oImg.style.top = top + "px"; break; default: break; } /* 临界值检查 */ } </script></body></html> |
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原文链接：https://blog.csdn.net/Frank_yzb123123/article/details/111030177
