1 <!DOCTYPE html> 2 <html> 3 4 <head> 5 <meta charset="UTF-8"> 6 <title></title> 7 <meta name="author" content="郭菊锋/702004176@qq.com"/> 8 <style type="text/css"> 9 .div { 10 display: none; 11 position: absolute; 12 width: 30px; 13 height: 30px; 14 margin: -15px 0 0 -15px; 15 background: rgba(37, 0, 255, 0.3); 16 -webkit-border-radius: 50%; 17 -moz-border-radius: 50%; 18 border-radius: 50%; 19 } 20 </style> 21 </head> 22 23 <body> 24 <div id="div" class="div"> 25 </div> 26 </body> 27 28 </html> 29 <script type="text/javascript"> 30 window.onload = function() { 31 var oDiv = document.getElementById("div"); 32 window.onmousemove = function(ev) { 33 var ev = ev || window.event; 34 var ofLeft = document.documentElement.offsetLeft || document.body.offsetLeft; 35 var ofTop = document.documentElement.offsetTop || document.body.offsetTop; 36 var oLeft = ev.clientX + ofLeft; 37 var oTop = ev.clientY + ofTop; 38 oDiv.style.display = "block"; 39 oDiv.style.left = oLeft + "px"; 40 oDiv.style.top = oTop + "px"; 41 } 42 43 } 44 </script>