苹果菜单

<!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>苹果菜单</title>
    <style>
    *{padding: 0;margin: 0;}
    input{border: 1px solid #333}
    #div1{position: absolute;bottom: 0;text-align: center;width: 100%;}
    #div img{width: 64px;}
    </style>
</head>
<body>
    <script>
        window.onload=function(){
            var oDiv =document.getElementById("div1");
            var oImg =document.querySelectorAll('img');
            document.onmousemove=function(ev){
                var ev =ev||window.event;
                for(var i=0;i<oImg.length;i++){
                    var x =oImg[i].offsetLeft+oImg[i].offsetWidth/2;
                    var y =oImg[i].offsetTop+oImg[i].offsetHeight/2+ oDiv.offsetTop;
                    var a =ev.clientX -x;
                    var b=ev.clientY -y;
                    var c =Math.sqrt(Math.pow(a,2) +Math.pow(b,2));
                    var scale =1-c/300;
                    if(scale < 0.5){
                        scale = 0.5;
                    }
                    oImg[i].style.width=scale*128 +'px';
                    oImg[i].style.height=scale*128 +'px';
                }
            };
            
         }
    </script>
    <div id="div1">
        <img src="images/pic1.png" alt="">
        <img src="images/pic2.png" alt="">
        <img src="images/pic3.png" alt="">
        <img src="images/pic4.png" alt="">
        <img src="images/pic5.png" alt="">
    </div>
</body>
</html>