js按键键盘键实现物体旋转效果

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title></title>
 6     <style>
 7 
 8         *{
 9             margin: 0;
10             padding: 0;
11         }
12         .div{
13             width: 100px;
14             height: 100px;
15             background-color: aqua;
16             position: absolute;
17         }
18 
19 
20     </style>
21 
22     <script>
23         28 
29         //文档就绪函数
30         onload=function(e){
31             //获取div
32             var div=document.getElementsByClassName("div")[0];
33 
34             //键盘点击事件
35             document.addEventListener("keydown",key);
36             //键盘点解旋转
37             var x=0;
38             function key(e) {
39                 if (e.keyCode == 39) {
40                     x += 5;
41                     var p = x + "deg";
42                     div.style.transform = "rotate(" + p + ")";
43                 } else if (e.keyCode == 37) {
44                     x -= 5;
45                     var p = x + "deg";
46                     div.style.transform = "rotate(" + p + ")";
47                 }
48             }
49 
50         }
51 
52 
53 
54     </script>
55 </head>
56 <body>
57 <div class="div" style="top: 0px;left: 0px">
58 
59 </div>
60 </body>
61 </html>