前端学习之路-CSS介绍，Html介绍，JavaScript介绍

标题图

CSS介绍

学前端必备掌握CSS样式，css为层叠样式表，用来定义页面的显示效果，加强用户的体验乐趣，那么如何用css到html中呢？

style属性方式

利用标签中的style属性来改变显示样式


 p标签

在head中加入style标签


 
  p { color: #FFF000;}

链接方式

总结CSS

选择器名称 {
属性名：属性值；
…….
}

属性与属性之间用分号隔开
属性与属性值用冒号连接

选择器

class选择器
id选择器

. class
# id

Html

html为超文本标记语言，通过标签来定义的语言，代码不用区分大小写。

头标签

：指定浏览器中标题栏显示的内容。<br><meta>：网页的描述信息。</p></blockquote>在标签中常用：<p>字体</p><pre class='brush:php;toolbar:false'><font size=5 color=red></pre><blockquote><p>标题标签：…..</p></blockquote><p>列表</p><pre class='brush:php;toolbar:false'><dl> <dt>名称</dt> <dd>Tom</dd> <dt>名称</dt> <dd>Tom</dd></dl></pre><pre class='brush:php;toolbar:false'><ol> <ul> <li></pre><p>图像</p><pre class='brush:php;toolbar:false'>图像标签：图像地图：<map></pre><p>表格</p><pre class='brush:php;toolbar:false'>表格标签：<table>标题<caption> 表头<th> 行<tr> 单元格<td></pre><pre class='brush:php;toolbar:false'><table border="1" width=”100%”> <caption>表格标题</caption> <tr algin=”center”> <th>姓名</th> <th>年龄</th> </tr> <tr algin=”center”> <td>dashucoding</td> <td>10</td> </tr></table></pre><p>超链接</p><pre class='brush:php;toolbar:false'>超链接定位标记</pre><p>表单</p><ul class="list-paddingleft-2"><li><p>文本框 text</p></li><li><p>密码框 password</p></li><li><p>单选框 radio</p></li><li><p>复选框 checkbox</p></li><li><p>提交按钮 submit</p></li><li><p>重置按钮 reset</p></li><li><p>按钮 button</p></li><li><p>图像 image</p></li></ul>Javascript介绍<p>Javascript是基于对象和事件驱动的脚本语言，为html提供信息的动态交互，安全性高，跨平台性强。JS是基于对象，且是弱类型。</p><p>引入：</p><pre class='brush:php;toolbar:false'></pre><p>将Javascript脚本代码嵌入到HTML文档中</p><pre class='brush:php;toolbar:false'></pre><pre class='brush:php;toolbar:false'></pre><pre class='brush:php;toolbar:false'><input type="button" name="mybtn" value="伪URL引入" ="javascript:alert('鼠标单击！')"> </pre>脚本代码的位置<ol class="list-paddingleft-2"><li><p>在<head></head>标记对之间放置</p></li><li><p>在<body></body>标记对之间放置</p></li></ol>变量<p>变量名以字母或下划线（"_"）开头<br>变量可以包含数字、从 A 至 Z 的大小写字母<br>Javascript区分大小写</p>变量的声明和赋值<blockquote><p>定义变量：var name;<br>赋值：name = dashucoding;</p></blockquote>常量<ol class="list-paddingleft-2"><li><p>整型</p></li><li><p>浮点型</p></li><li><p>字符串型</p></li><li><p>数据类型</p></li><li><p>弱类型，区分大小写</p></li></ol>数值型<p>整型、浮点型<br>字符串型<br>单引号或双引号引起来<br>布尔型<br>true, false<br>Null、undefined</p>运算符<p><strong>算术运算符</strong></p><pre class='brush:php;toolbar:false'>+、-、 * 、 / 、%、++、--</pre><p><strong>比较运算符</strong></p><pre class='brush:php;toolbar:false'>==、!=、>、>=、<、<=</pre><p><strong>逻辑运算符</strong></p><pre class='brush:php;toolbar:false'>&&、||、！</pre><p><strong>条件运算符</strong></p><pre class='brush:php;toolbar:false'>？：</pre>函数<pre class='brush:php;toolbar:false'>function 函数名(参数...){ 执行语句； return 返回值； }</pre>数组<pre class='brush:php;toolbar:false'>var arr = new Array();</pre><pre class='brush:php;toolbar:false'>for(var x=0; x循环语句<ol class="list-paddingleft-2"><li><p>for语句</p></li><li><p>while语句</p></li><li><p>for…in语句</p></li><li><p>中断循环语句</p></li></ol><pre class='brush:php;toolbar:false'>for(初始化; 条件; 增量){ 语句; }</pre><pre class='brush:php;toolbar:false'>while(条件){ 语句; }</pre><pre class='brush:php;toolbar:false'>for(变量 in 对象){ 语句; }</pre><p><br><br>作者：达叔小生<br>链接：https://www.jianshu.com/p/5a85cd80a0a9<br><br></p><p><br></p></div> </div> <div style="clear: both;"></div> <div class="author-info fl"> <div><span class="gray">转载请注明：</span>文章转载自 <a 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