实用的js动画
勾海超
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
<!--
function addLoadEvent(func){
var oldonload = window.onload;
if(typeof window.onload != 'function'){
window.onload = func;
}
else{
window.onload = function(){
oldonload();
func();
}
}
}
function moveElement(elementID,final_x,final_y,interval){
if(!document.getElementById) return false;
if(!document.getElementById(elementID)) return false;
var elem = document.getElementById(elementID);
var xpos = parseInt(elem.style.left);
var ypos = parseInt(elem.style.top);
if(xpos == final_x && ypos == final_y){
return true;
}
if(xpos < final_x){
xpos++;
}
if(xpos > final_x){
xpos--;
}
if(ypos < final_y){
ypos++;
}
if(ypos > final_y){
ypos--;
}
elem.style.left = xpos + "px";
elem.style.top = ypos + "px";
var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
movement = setTimeout(repeat,interval);
}
function positionMessage(){
if(!document.getElementById) return false;
if(!document.getElementById("message")) return false;
var elem = document.getElementById("message");
elem.style.position = "absolute";
elem.style.left = "50px";
elem.style.top = "100px";
moveElement("message",125,25,20);
if(!document.getElementById("message2")) return false;
var elem = document.getElementById("message2");
elem.style.position = "absolute";
elem.style.left = "50px";
elem.style.top = "50px";
moveElement("message2",125,75,20);
}
addLoadEvent(positionMessage);
-->
</script>
</head>
<body>
<p id="message">Whee!</p>
<p id="message2">Whoa!</p>
</body>
</html>
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