JS寫滑稽笑臉運動效果
效果演示:
(就這玩意兒,差點寫崩了...)
代碼:
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>滑稽笑臉運動</title> <meta name='author' content='marinerzp'> <style> *{padding: 0;margin: 0;} html,body{ width: 100%; height: 100%; } #main{ width: 100px; height: 100px; border-radius: 50%; background:url(images/1.jpg) 0 0/100px 100px; position: absolute; left: 0; top: 0; z-index: 3; } .show{ width: 50px; height: 50px; border-radius: 50%; background-color: rgb(239, 187, 101); position: absolute; animation: disappear 1.2s ; animation-fill-mode: forwards; } @keyframes disappear{ 0%{opacity: 1;transform:scale(1); } 100%{opacity: 0;transform:scale(0); } } </style></head><body> <div id='main'> </div> <script> let Omain=document.querySelector(’#main’); let MaxLeft=window.innerWidth-Omain.offsetWidth; let MaxTop=window.innerHeight-Omain.offsetHeight; window.οnresize=function(){//監聽窗口大小改變事件 MaxLeft=window.innerWidth-Omain.offsetWidth; MaxTop=window.innerHeight-Omain.offsetHeight; }; /* 水平方向上:以向右為正方向 豎直方向上:以向下為正方向 */ let Vx=6;//3px/s let Vy=9;//4px/s let X=0,Y=0; ~~function move(){ X+=Vx; Y+=Vy; if (Y>=MaxTop) {Y=MaxTop;Vy=-Vy; } if (Y<=0) {Y=0;Vy=-Vy; } if (X>=MaxLeft) {X=MaxLeft;Vx=-Vx; } if (X<=0) {X=0;Vx=-Vx; } Omain.style.left=`${X}px`; Omain.style.top=`${Y}px`; createTail(X,Y);//生成拖尾 requestAnimationFrame(move); }(); function createTail(X,Y){ let node=document.createElement(’p’); node.classList.add(’show’); node.style.cssText=`left:${X+20}px;top:${Y+20}px`; document.body.appendChild(node); setTimeout(()=>{document.body.removeChild(node);node=null; },1200); } </script></body></html>
總結
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