1.元素移动
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);
<body>
<p id="message">Whee!</p>
<p id="message2">Whoa!</p>
</body>
2.图片滑动
function prepareSlideshow() {
// Make sure the browser understands the DOM methods
if (!document.getElementsByTagName) return false;
if (!document.getElementById) return false;
// Make sure the elements exist
if (!document.getElementById("linklist")) return false;
if (!document.getElementById("preview")) return false;
// Apply styles to the preview image
var preview = document.getElementById("preview");
preview.style.position = "absolute";
preview.style.left = "0px";
preview.style.top = "0px";
// Get all the links in the list
var list = document.getElementById("linklist");
var links = list.getElementsByTagName("a");
// Attach the animation behavior to the mouseover event
links[0].onmouseover = function() {
moveElement("preview",-100,0,10);
}
links[1].onmouseover = function() {
moveElement("preview",-200,0,10);
}
links[2].onmouseover = function() {
moveElement("preview",-300,0,10);
}
}
addLoadEvent(prepareSlideshow);
function moveElement(elementID,final_x,final_y,interval) {
if (!document.getElementById) return false;
if (!document.getElementById(elementID)) return false;
var elem = document.getElementById(elementID);
//在动画之前清除之前的动画
if (elem.movement) {
clearTimeout(elem.movement);
}
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+")";
elem.movement = setTimeout(repeat,interval);
}
<body>
<h1>Web Design</h1>
<p>These are the things you should know.</p>
<ol id="linklist">
<li>
<a href="structure.html">Structure</a>
</li>
<li>
<a href="presentation.html">Presentation</a>
</li>
<li>
<a href="behavior.html">Behavior</a>
</li>
</ol>
<div id="slideshow">
<img src="topics.gif" alt="building blocks of web design" id="preview" />
</div>
</body>
Paste_Image.png
