欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

用JS写一个可以用键盘方向键控制的动画

程序员文章站 2022-03-21 11:30:01
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:

用JS写一个可以用键盘方向键控制的动画:
效果如下:
用JS写一个可以用键盘方向键控制的动画
好了,代码如下:

<!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>

本文地址:https://blog.csdn.net/Frank_yzb123123/article/details/111030177