经常，我们在浏览各种网页的时候，都会有各种动画效果展示，像下图所示的是很多网上商城常用的货品展示方式，同类的货品并排展现在窗口上，用户如果看中了哪一款商品想要查看详情的话，只要将鼠标放上该商品的区域，原本折叠起来的商品便会自动展开，详情便会展现在用户面前，而这一动画，就是利用了DOM+JS结合来实现的，今天的小练习就是要实现这个效果。
首先，先将页面基本的框架用html实现，将四张图封装在了一个名为“container”的div块中
1 <!doctype html> 2 <meta charset="UTF-8"> 3 <html> 4 <head> 5 <title> 6 鼠标滑过页面自动变大 7 </title> 8 <link rel="stylesheet" href="styles/reset.css" /> 9 <link rel="stylesheet" href="styles/slidingdoors.css" /> 10 <script src="slidlingdoors.js"></script> 11 </head> 12 <body> 13 <div id="container"> 14 <img src="./images/door1.png"/> 15 <img src="./images/door2.png"/> 16 <img src="./images/door3.png"/> 17 <img src="./images/door4.png"/> 18 </div> 19 </body> 20 </html>
接着，我将大体的样式用了两个样式表修饰如下：
依次为
slidingdoors.css和reset.css:
1 #container { 2 height: 477px; 3 margin: 0 auto; 4 border-right: 1px solid #ccc; 5 border-bottom: 1px solid #ccc; 6 overflow: hidden; 7 position: relative; 8 } 9 10 #container img { 11 position: absolute; 12 display: block; 13 left: 0; 14 border-left: 1px solid #ccc; 15 }
1 /** 2 * Eric Meyer's Reset CSS v2.0 (http://meyerweb.com/eric/tools/css/reset/) 3 * http://cssreset.com 4 */ 5 html, body, div, span, applet, object, iframe, 6 h1, h2, h3, h4, h5, h6, p, blockquote, pre, 7 a, abbr, acronym, address, big, cite, code, 8 del, dfn, em, img, ins, kbd, q, s, samp, 9 small, strike, strong, sub, sup, tt, var, 10 b, u, i, center, 11 dl, dt, dd, ol, ul, li, 12 fieldset, form, label, legend, 13 table, caption, tbody, tfoot, thead, tr, th, td, 14 article, aside, canvas, details, embed, 15 figure, figcaption, footer, header, hgroup, 16 menu, nav, output, ruby, section, summary, 17 time, mark, audio, video { 18 margin: 0; 19 padding: 0; 20 border: 0; 21 font-size: 100%; 22 font: inherit; 23 vertical-align: baseline; 24 } 25 /* HTML5 display-role reset for older browsers */ 26 article, aside, details, figcaption, figure, 27 footer, header, hgroup, menu, nav, section { 28 display: block; 29 } 30 body { 31 line-height: 1; 32 } 33 ol, ul { 34 list-style: none; 35 } 36 blockquote, q { 37 quotes: none; 38 } 39 blockquote:before, blockquote:after, 40 q:before, q:after { 41 content: ''; 42 content: none; 43 } 44 table { 45 border-collapse: collapse; 46 border-spacing: 0; 47 }
接下来，就要实现滑动效果了，js代码如下：
1 window.onload=function(){ 2 var box=document.getElementById("container"); 3 var imgs=box.getElementsByTagName("img"); 4 var imgwidth=imgs[0].offsetWidth; 5 var exposewidth=160; 6 var boxwidth=imgwidth+exposewidth*(imgs.length-1); 7 box.style.width=boxwidth+'px'; 8 function setImgPos(){ 9 for(var i=1;i<imgs.length;i++) 10 { 11 imgs[i].style.left=imgwidth+exposewidth*(i-1)+'px'; 12 } 13 } 14 setImgPos(); 15 var translate=imgwidth-exposewidth; 16 for(var i=0;i<imgs.length;i++) 17 { 18 (function(i){ 19 imgs[i].onmouseover=function(){ 20 setImgPos(); 21 for(var j=1;j<=i;j++) 22 { 23 imgs[j].style.left=parseInt(imgs[j].style.left,10)-translate+'px'; 24 } 25 }; 26 })(i); 27 } 28 };
弄好后的效果图如下：
遇到的问题：
1.图片复位函数中i、j变量傻傻分不清；
2.做出来的效果一张图片复位后把其余未复位图片都挡住了，主要是复位函数出了小问题。
经验：js函数变量复杂，逻辑严谨，写代码时一定要谨慎小心