js实现酷炫的鼠标跟随效果

js代码如下，可插入任何网页。

// ENTER TEXT BELOW. CAN *NOT* INCLUDE NORMAL HTML CODE.
var text='W elcom e to Moxiaonai\'s B log *_*' ;
var delay=30;                              // SPEED OF TRAIL

var Xoff=10;                                // PIXEL COUNT FROM THE LEFT OF THE CURSOR (- VALUES GO TO LEFT)

var Yoff=-25;                              // PIXEL COUNT FROM THE TOP OF THE CURSOR (- VALUES GO UP)

var txtw=9;                               // AMOUNT OF PIXEL SPACE EACH CHARACTER OCCUPIES

var beghtml='<font color="#FF0000"><b>';   // OPTIONAL HTML CODE THAT EFFECTS WHOLE TEXT STRING SUCH AS FONT COLOR, SIZE, ETC.

var endhtml='</b></font>';                 // END HTML CODE. MOSTLY USED IF ABOVE SETTING IS USED.

//********** NO NEED TO EDIT BELOW HERE **********\\

ns4 = (navigator.appName.indexOf("Netscape")>=0 && document.layers)? true : false;

ie4 = (document.all && !document.getElementById)? true : false;

ie5 = (document.all && document.getElementById)? true : false;

ns6 = (document.getElementById && navigator.appName.indexOf("Netscape")>=0 )? true: false;

var txtA=new Array();

text=text.split('');

var x1=0;

var y1=-1000;

var t='';

for(i=1;i<=text.length;i++){

t+=(ns4)? '<layer name="txt'+i+'" top="-100" left="0" width="'+txtw+'" height="1">' : '<div id="txt'+i+'" style="position:absolute; top:-100px; left:0px; height:1px; width:'+txtw+'; visibility:visible;">';

t+=beghtml+text[i-1]+endhtml;

t+=(ns4)? '</layer>' : '</div>';

}

document.write(t);

function moveid(id,x,y){

if(ns4)id.moveTo(x,y);

else{

id.style.left=x+'px';

id.style.top=y+'px';

}}

function animate(evt){

x1=Xoff+((ie4||ie5)?event.clientX+document.body.scrollLeft:evt.pageX);

y1=Yoff+((ie4||ie5)?event.clientY+document.body.scrollTop:evt.pageY);

}

function getidleft(id){

if(ns4)return id.left;

else return parseInt(id.style.left);

}

function getidtop(id){

if(ns4)return id.top;

else return parseInt(id.style.top);

}

function getwindowwidth(){

if(ie4||ie5)return document.body.clientWidth+document.body.scrollLeft;

else return window.innerWidth+pageXOffset;

}

function movetxts(){

for(i=text.length;i>1;i=i-1){

if(getidleft(txtA[i-1])+txtw*2>=getwindowwidth()){

moveid(txtA[i-1],0,-1000);

moveid(txtA[i],0,-1000);

}else moveid(txtA[i], getidleft(txtA[i-1])+txtw, getidtop(txtA[i-1]));

}

moveid(txtA[1],x1,y1);

}

window.onload=function(){

for(i=1;i<=text.length;i++)txtA[i]=(ns4)?document.layers['txt'+i]:(ie4)?document.all['txt'+i]:document.getElementById('txt'+i);

if(ns4)document.captureEvents(Event.MOUSEMOVE);

document.onmousemove=animate;

setInterval('movetxts()',delay);

}