【js编程艺术】小制作五

时间：2021-08-27 14:56:12

1.html

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <title>Web Design</title>

    <link rel="stylesheet" type="text/css" href="styles/list.css">

</head>

<body>

    <h1>Web Design</h1>

    <p>These are the things you should know</p>

    <ol id="linklist">

        <li>

            <a href="images/shuangyu.jpg">shuangyu</a>

        </li>

        <li>

            <a href="images/baiyang.jpg">baiyang</a>

        </li>

        <li>

            <a href="images/jinniu.jpg">jinniu</a>

        </li>

        <li>

            <a href="images/shuangzi.jpg">shuangzi</a>

        </li>

    </ol>

    <script type="text/javascript" src="scripts/prepareSlideshow.js"></script>

</body>

</html>

2.css

#slideshow{

    width: 100px;

    height: 100px;

    position: relative;

    overflow: hidden;

}

#preview{

    position: absolute;

}

3.js

function addLoadEvent(func) {

    var oldonload = window.onload;

    if(typeof window.onload != "function"){

        window.onload = func;

    }else{

        window.onload = function(){

            oldonload();

            func();

        }

    }

}

function insertAfter(newElement, targetElement){

    var parent = targetElement.parentNode;

    if(parent.lastChild == targetElement){

        parent.appendChild(newElement);

    }else{

        parent.insertBefore(newElement, targetElement.nextSibling);

    }

}

function moveElement(elementID, final_x, final_y, interval){

    if(!document.getElementById) return false;

    if(!document.getElementById(elementID)) return false;

    var elem = document.getElementById(elementID);

    if(elem.movement){

        clearTimeout(elem.movement);

    }

    if(!elem.style.left){

        elem.style.left = "0px";

    }

    if(!elem.style.top){

        elem.style.top = "0px";

    }

    var xpos = parseInt(elem.style.left);

    var ypos = parseInt(elem.style.top);

    var dist = 0;

    if(xpos == final_x && ypos == final_y){

        return true;

    }

    if(xpos < final_x){

        dist = Math.ceil((final_x - xpos) / 10);

        xpos = xpos + dist;

    }

    if(xpos > final_x){

        dist = Math.ceil((xpos - final_x) / 10);

        xpos = xpos - dist;

    }

    if(ypos < final_y){

        dist = Math.ceil((final_y - xpos) / 10);

        ypos = ypos + dist;

    }

    if(ypos > final_y){

        dist = Math.ceil((xpos - final_y) / 10);

        ypos = ypos - dist;

    }

    elem.style.left = xpos + "px";

    elem.style.top = ypos + "px";

    var repeat = "moveElement('"+elementID+"', "+final_x+", "+final_y+", "+interval+")";

    elem.movement = setTimeout(repeat, interval);

}

function prepareSlideshow(){

    if(!document.getElementsByTagName) return false;

    if(!document.getElementById) return false;

    if(!document.getElementById("linklist")) return false;

    var slideshow = document.createElement("div");

    slideshow.setAttribute("id", "slideshow");

    var preview = document.createElement("img");

    preview.setAttribute("src", "images/shuangbaijinshuangzi.gif");

    preview.setAttribute("alt", "buliding blocks of web design");

    preview.setAttribute("id", "preview");

    slideshow.appendChild(preview);

    var list = document.getElementById("linklist");

    insertAfter(slideshow, list);

    var links = list.getElementsByTagName("a");

    links[0].onmouseover = function(){

        moveElement("preview", 0, 0, 10);

    }

    links[1].onmouseover = function(){

        moveElement("preview", -100, 0, 10);

    }

    links[2].onmouseover = function() {

        moveElement("preview", -200, 0, 10)

    }

    links[3].onmouseover = function() {

        moveElement("preview", -300, 0, 10)

    }

}

addLoadEvent(prepareSlideshow);

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