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这次的鼠标跟随用到了透明，本来这个脚本的效果只是尾巴处拖动一串的图片，然后重叠在一起，我加了一个透明，这样移动鼠标的时候因为图片透明的缘故，就有了慧尾的效果，渐变透明的尾巴跟在后面，效果不错。
演示地址:点击这里
html部分:
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<html>
<head>
<title>javascriptboy</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<style type="text/css">
BODY {overflow: scroll; overflow-x: hidden;}
img { filter: Alpha(Opacity=25)}
</style>
<body bgcolor="#FFFFFF" text="#000000">
<script language="javascript1.2">
<!--
var trailLength = 20 // The length of trail (8 by default; put more for longer "tail")
var path = "cursor.gif" // URL of your image
// do NOT modify anything beyond this point
var isIE = false,isNav = false,range = "all.",style = ".style",i,d = 0
var topPix = ".pixelTop",leftPix = ".pixelLeft",images,storage
if (document．layers) { // browser sniffer
isNav = true,range = "layers.",style = "",topPix = ".top",leftPix = ".left"
} else if (document．all) {
isIE = true
}
function initTrail() { // prepares the script
images = new Array() // prepare the image array
for (i = 0; i < parseInt(trailLength); i++) {
images = new Image()
images.src = path
}
storage = new Array() // prepare the storage for the coordinates
for (i = 0; i < images.length*3; i++) {
storage = 0
}
for (i = 0; i < images.length; i++) { // make divs for IE and layers for Navigator
(isIE) ? document．write(<div id="obj + i + " style="position: absolute; z-Index: 100; height: 0; width: 0"><img src=" + images.src + "></div>) : document．write(<layer name="obj + i + " width="0" height="0" z-index="100"><img src=" + images.src + "></layer>)
}
trail()
}
function trail() { // trailing function
for (i = 0; i < images.length; i++) { // for every div/layer
eval("document．" + range + "obj" + i + style + topPix + "=" + storage[d]) // the Y-coordinate
eval("document．" + range + "obj" + i + style + leftPix + "=" + storage[d+1]) // the X-coordinate
d = d+2
}
for (i = storage.length; i >= 2; i--) { // save the coordinate for the div/layer thats behind
storage = storage[i-2]
}
d = 0 // reset for future use
var timer = setTimeout("trail()",10) // call recursively
}
function processEvent(e) { // catches and processes the mousemove event
if (isIE) { // for IE
storage[0] = window.event.y+document．body.scrollTop+10
storage[1] = window.event.x+document．body.scrollLeft+10
} else { // for Navigator
storage[0] = e.pageY+12
storage[1] = e.pageX+12
}
}
if (isNav) {
document．captureEvents(Event.MOUSEMOVE) // Defines what events to capture for Navigator
}
if (isIE || isNav) { // initiates the script
initTrail()
document．onmousemove = processEvent // start capturing
}
//-->
</script>
</body>
</html> 
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