css3高级运动keyframes

时间：2023-03-09 07:32:04
css3高级运动keyframes 
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Document</title>

    <script>

            window.onload=function(){

                var arr=[-45,60,-75,90];

                var i=0;

                box.onclick=function(){

                var ready=false;

                i++;

                var oH=document.getElementsByTagName('head')[0];

                var oS=document.createElement('style');

                oH.appendChild(oS);

                  oS.innerHTML=

                    '@keyframes rotate{'+

                    '0%{'+

                    'transform: rotate('+arr[i%4]+'deg);'+

                    '}'+

                    '100%{'+

                    'transform: rotate(-'+arr[i%4]+'deg);'+

                    '}'+

                    '}';

                box.style.animation='1s rotate linear';

                box.addEventListener('animationend',function(){

                    if(ready)return;

                    ready=true;

                    document.getElementsByTagName('head')[0].removeChild(oS);

                },false);

                console.log(oS.innerHTML);

                };

            };

    </script>

</head>

<body>

    <div id="box" style="background:red; width:100px; height:100px; margin:50px auto;"></div>

</body>

</html>

　　

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