电脑/html5/前端/前端修炼日记.html

<!DOCTYPE html>
<html>
<head>
<!-- 2016-07-30 六 23:07 -->
<meta  charset="utf-8">
<meta  name="viewport" content="width=device-width, initial-scale=1">
<title>前端修炼日记</title>
<meta  name="generator" content="Org-mode">
<meta  name="author" content="万泽(德山书生)">
<meta  name="description" content="制作者邮箱：a358003542@gmail.com"
>
<style type="text/css">
body {
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.title {
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video{
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figure p{
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table
*/
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#content .section ul,#content .toctree-wrapper ul,article ul{
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.figure p{
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ul.nav li.active ul li ul li {
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ul.nav li.active > a {
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</head>
<body>
<div id="content">
<header>
<h1 class="title">前端修炼日记</h1>
</header><nav id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#orgheadline1">1. 响应式布局</a></li>
</ul>
</div>
</nav>


<div class="outline-2">
<h2 id="orgheadline1">响应式布局</h2>
<div class="outline-text-2" id="text-1">
<p>
请读者先阅读 <a href="http://www.ruanyifeng.com/blog/2012/05/responsive_web_design.html">这篇文章</a> 。这篇刚开始 Ethan Marccote 给出的那个例子有个非常重要的信息，那就是设备的像素分级:
</p>

<ul class="org-ul">
<li>大于1300像素</li>
<li>600到1300像素</li>
<li>400到600像素</li>
<li>小于400像素</li>
</ul>

<p>
这个像素分级可以为后面我们要根据不同的设备进行css进行设置提供了参考。
</p>

<p>
然后一般网页都要加上这一行:
</p>
<pre>
&lt;meta name="viewport" content="width=device-width, initial-scale=1" /&gt;
</pre>
<p>
意思是网页默认宽度为设备宽度，原始缩放比为1。
</p>

<p>
然后就是各个元素宽度最好不要有 <code>width: xxx px</code> 这样写死了的css设置，而是 <code>%</code> 或者 <code>auto</code> 。字体的大小也都推荐使用 <code>em</code> 这样的相对大小。
</p>

<p>
h1 默认大小是 1.5em 。
</p>
<pre>
h1 {
    font-size: 1.5em; 
}
</pre>

<p>
small 默认是 0.875em 。
</p>
<pre>
small {
    font-size: 0.875em;
}
</pre>

<p>
流动式布局，各个区块的位置都是浮动的，有些情况下会需要使用 <code>position: absolute</code> ，这会带来很多麻烦，尽量少用。
</p>

<p>
根据屏幕响应式多个css配置适应: 【因为css有很多通用配置是多设备皆适用的，下面这些根据屏幕响应的css应该放在css文件的最后面。】
</p>

<p>
参看 <a href="http://learn.shayhowe.com/advanced-html-css/responsive-web-design/">这篇文章</a> ，其提到了现在流行的 mobile-first 设计思路，也就是有限照顾手机小屏幕设备的设计流程。先写好通用css配置，然后css文件最后面如下设置这些屏幕响应css设置。从最小的屏幕照顾起:  
</p>
<div class="highlight"><pre><span></span><span class="k">@media</span> <span class="nt">screen</span> <span class="nt">and</span> <span class="o">(</span><span class="nt">min-width</span><span class="o">:</span> <span class="nt">400px</span><span class="o">)</span> <span class="p">{</span>
    <span class="nt">这里放着屏幕小于400px时的配置</span>
<span class="p">}</span>

<span class="k">@media</span> <span class="nt">screen</span> <span class="nt">and</span> <span class="o">(</span><span class="nt">min-width</span><span class="nd">:600px</span><span class="o">)</span><span class="p">{</span>
    <span class="nt">这里放着屏幕大于400px小于600px的配置</span>
<span class="p">}</span>
<span class="k">@media</span> <span class="nt">screen</span> <span class="nt">and</span> <span class="o">(</span><span class="nt">min-width</span><span class="nd">:1000px</span><span class="o">)</span><span class="p">{</span>
    <span class="nt">这里放着屏幕大于600px小于1000px的配置</span> 
<span class="p">}</span>

<span class="k">@media</span> <span class="nt">screen</span> <span class="nt">and</span> <span class="o">(</span><span class="nt">min-width</span><span class="nd">:1400px</span><span class="o">)</span><span class="p">{</span>
    <span class="nt">这里放着屏幕大于1400px时的css配置</span>
<span class="p">}</span>
</pre></div>

<p>
图片的自适应，如下设置最大宽度。
</p>
<pre>
img { max-width: 100%;}
</pre>
</div>
</div>
</div>
</body>
</html>