学习JQuery - 11

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2. 效果及持续性

我们在文章大部分用“Read more”来缩短文章读取速度。

这是我们就要用到显示和隐藏功能。

例如：

Abraham Lincoln's Gettysburg Address

Text Size

Fourscore and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal.

The brave men, living and dead, who struggled here have consecrated it, far above our poor power to add or detract. The world will little note, nor long remember, what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced.

It is rather for us to be here dedicated to the great task remaining before us—that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain—that this nation, under God, shall have a new birth of freedom and that government of the people, by the people, for the people, shall not perish from the earth.

但我们点击“read more”时候会显示隐藏的内容。

js代码

$('p').eq(1).show();

隐藏时

$('p').eq(1).hide();

在显示/隐藏时能否增加其他效果呢？

（1）渐进效果
显示

$('p').eq(1).fadeIn();

隐藏

$('p').eq(1).fadeOut();

（2）滑动效果

显示

$('p').eq(1).slideUp()

隐藏

$('p').eq(1).slideDown()

在此效果的方法中还有一个很有用的：slideToggle()。

当“段落”隐藏时，执行此方法时就显示“段落”；反之相同。

附：

chapter4-2.html

<!DOCTYPE html><html>  <head>    <meta charset="utf-8">  <title>Abraham Lincoln's Gettysburg Address</title>    <link rel="stylesheet" href="chapter04.css" type="text/css" />    <script src="jquery-1.10.2.js"></script>    <script src="chapter04-2.js"></script>  </head>  <body>    <div id="container">      <h2>Abraham Lincoln's Gettysburg Address</h2>      <div id="switcher">        <div class="label">Text Size</div>        <button id="switcher-default">Default</button>        <button id="switcher-large">Bigger</button>        <button id="switcher-small">Smaller</button>      </div>      <div class="speech">        <p>Fourscore and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal.</p>        <p>Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battlefield of that war. We have come to dedicate a portion of that field as a final resting-place for those who here gave their lives that the nation might live. It is altogether fitting and proper that we should do this. But, in a larger sense, we cannot dedicate, we cannot consecrate, we cannot hallow, this ground.</p>        <a href="#" class="more">read more</a>        <p>The brave men, living and dead, who struggled here have consecrated it, far above our poor power to add or detract. The world will little note, nor long remember, what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced.</p>        <p>It is rather for us to be here dedicated to the great task remaining before us—that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain—that this nation, under God, shall have a new birth of freedom and that government of the people, by the people, for the people, shall not perish from the earth.</p>      </div>    </div>  </body></html>

chapter04.css

@charset "utf-8";/* CSS Document *//***************************************   Default Styles************************************** */html, body {  margin: 0;  padding: 0;}body {  font: 62.5% Verdana, Helvetica, Arial, sans-serif;  color: #000;  background: #fff;}#container {  font-size: 1.2em;  margin: 10px 2em;}h1 {  font-size: 2.5em;  margin-bottom: 0;}h2 {  font-size: 1.3em;  margin-bottom: .5em;}h3 {  font-size: 1.1em;  margin-bottom: 0;}a {  color: #06581f;}/* Chapter Styles */#switcher {  width: 300px;  padding: .5em;  border: 1px solid #777;}.label {  width: 130px;  margin: .5em 0;  cursor: pointer;}

chapter04-2.js

$(document).ready(function() {$('p').eq(1).hide();$('#switcher').click(function() {$('a.more').show();    });$('a.more').click(function() {        //$('p').eq(1).show();//$('p').eq(1).fadeIn();//$('p').eq(1).slideUp(800);$('p').eq(1).slideToggle('slow');$(this).hide();    });});

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