<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<span id="a" style="position:absolute;border: 1px solid blue">
跟着我
</span>
<script>
function a(){
var div = document.getElementById("a");
if (!div) {
return;
}
var intX = window.event.clientX;
var intY = window.event.clientY;
div.style.left = intX + "px";
div.style.top = intY + "px";
}
document.onmousemove = a;
</script>
</body>
</html>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<span id="a" style="border: 1px solid blue">
跟着我
</span>
<script>
function a(){
var div = document.getElementById("a");
div.style.position=‘absolute‘;
div.style.left = window.event.clientX+ "px";
div.style.top =window.event.clientY+ "px";
}
document.onmousemove = a;
</script>
</body>
</html>
超简单版的跟着鼠标移动
原文：http://www.cnblogs.com/zxy945/p/6524945.html