HTML
Hyper Text Mark-up Language（超文本标记语言）
超文本：超链接
标记语言：由标记（标签）构成的语言
一个简单的例子
<!DOCTYPE html><html lang="en"> <!--html根标签，代表html文档的开始和结束--><head> <!--html的头部分，设置网页属性，可以设置标题-->
<meta charset="UTF-8">
<title>Hello World!</title></head><body> <!--html的正文部分，放置想要在页面上显示的内容--><!--在HTML中不支持空格、制表符、回车--><h1 id="静夜思">静夜思</h1> <!--不分开始和结束的标签，自闭合标签--><p> <!--段落标记，有上下边距即行间距-->
<font color="red" size="12">床</font>前明月光，<br /> <!--指定字体的颜色、大小-->
疑似地上霜，<br />
举头望明月，<br />
低头思故乡，<br /></p><hr /> <!--分隔符--><b>哈哈</b><br /> <!--加粗-->H<sub>2</sub>O<br /> <!--下标-->2<sup>3</sup><br /> <!--上标--></body></html>转义字符
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>转义字符</title></head><body>哈 哈<br /> <!--空格-->a<b c>d<br /> <!--大于小于需要转义，有可能误当成标签-->1<3>2<br /> <!--标签里不可以是数字，所以这样写直接就是< >--></body></html>列表和图形
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>列表标签</title></head><body><h2 id="爱好">爱好</h2><ul type="square"> <!--无序列表-->
<li>抽烟</li>
<li>喝酒</li>
<li>打游戏</li></ul><hr><ol type="A" start="10"> <!--有序列表，从A的后十位开始-->
<li>小明</li>
<li>小强</li>
<li>小军</li></ol><hr><dl>
<dt>水果</dt>
<dd>苹果</dd>
<dd>草莓</dd>
<dd>香蕉</dd>
<dt>零食</dt>
<dd>辣条</dd>
<dd>奥利奥</dd>
<dd>绿豆糕</dd></dl><!--图形标签，border是边界，alt是加载不出来显示，title是鼠标放置时显示的--><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="HTML" title="我是一张普通的图片"></body></html>超链接
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>超链接</title></head><body><!--a超链接标签，href用于指定链接，以下的网页在同一文件夹内，traget的_blank不覆盖当前页面，而是打开新的页面--><!--href由协协议名+协议内容组成--><a href="排版标记.html" target="_blank">点我跳转</a><br /><a href="https://www.baidu.com">百度</a><br /><a href="mailto:haiyu19931121@163.com" target="_blank">联系我们</a><br /><a href="thunder://abcdefg.mp4" target="_blank">下载</a><br /><a name="回来"></a><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><img src="/static/imghwm/default1.png" data-src="image.png" class="lazy" border="1" style="max-width:90%" style="max-width:90%" alt="What is HTML? A detailed introduction to html" ><br /><a href="#回来">回到顶部</a> <!--#表示使用本地超链接--></body></html>表格
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>表格标签</title></head><body><!--cellpadding是文字距离内边框的距离，cellspacing是内边框和外边框的距离--><table border="1" cellspacing="0" width="200">
<tr> <!--tr表示行-->
<th>姓名</th> <!--表头，自带居中和加粗-->
<th>年龄</th>
</tr>
<tr>
<td>小红</td> <!--td表示列-->
<td>13</td>
</tr>
<tr>
<td>小强</td>
<td>15</td>
</tr></table></body></html>
border是最外边的蓝线的宽度，不要理解成了内外边框的距离，cellspacing才是。
框架标签
如用一个页面来显示3个页面，共需要四个。用4.html来显示其他三个
4.html
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>Title</title></head><frameset rows="30%, 70%"> <!--上下比例3:7-->
<frame src="1.html" /> <!--占了30%-->
<frameset cols="30%, 70%"> <!--左右比例3:7-->
<frame src="2.html" /> <!--占30%-->
<frame src="3.html" name="_mine"/> <!--占70%，name为_mine,方便点击2.html中的超链接转到3.html中显示-->
</frameset></frameset></html>1.html
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>Title</title></head><body><h1 id="首页">首页</h1></body></html>2.html
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>Title</title></head><body><h1 id="首页">首页</h1></body></html>3.html
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>表格标签</title></head><body><!--cellpadding是文字距离内边框的距离，cellspacing是内边框和外边框的距离--><table border="1" cellspacing="0" width="200">
<tr> <!--tr表示行-->
<th>姓名</th> <!--表头，自带居中和加粗-->
<th>年龄</th>
</tr>
<tr>
<td>小红</td> <!--td表示列-->
<td>13</td>
</tr>
<tr>
<td>小强</td>
<td>15</td>
</tr></table></body></html>表单标签
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>表单</title></head><body><!--form标识表单范围-->
<form action="#"> <!--action决定提交的位置，还没学服务器，先提交给自己，没什么意义-->
<!--input type:决定输入类型 name:提交的键 size:文本输入框的长度 maxlenght:显示文本框输入长度（能输入的字符个数） readonly:只读，不能修改，不影响提交 disable:禁用，被禁用的表单项不会提交。所有的input属性都能用 form action：提交的地址 method：提交的方法 get: 1、将键值对拼接在url地址 2、安全性不太好 3、提交的长度有限 post: 1、参数不在url地址 2、安全性比较好 3、理论上提交长度没有限制 -->
用户名：<input type="text" name="username" value="admin" disabled="disabled"/><br /> <!--name提交的键-->
密码：<input type="password" name="password"/><br /> <!--name提交的键-->
性别：男<input type="radio" name="sex" value="male" />女<input type="radio" name="sex" value="female"><br /> <!--name提交的键-->
爱好：抽烟<input type="checkbox" name="habit" value="smoke">
喝酒<input type="checkbox" name="habit" value="drink">
吃零食<input type="checkbox" name="habit" value="eat"><br />
学历：<select name="edu" >
<option value="zk">专科</option>
<option value="bk">本科</option>
<option value="yjs">研究生</option>
<option value="bss">博士生</option>
</select><br />
个人说明：<textarea rows="10" cols="30" name="desc">这家伙很懒，什么都没留下</textarea><br />
近照：<input type="file" name="file"><br />
<!--隐藏了但是能提交-->
<input type="hidden" name="haha" value="heihei">
<input type="submit" /><input type="reset" />
</form></body></html>meta标签
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <!--指定字符集--><meta http-equiv="Refresh" content="3;url=https://www.baidu.com"> <!--3秒刷新并定向到百度-->
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