1. background color and background image
first development tools used here HBuilder X, on development tools to write code
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"><!--告诉浏览器以哪种编码方式打开该文件--> 并不是设置文件的格式为utf-8字符集，而是让浏览器以utf-8打开
<title>HTML背景颜色和格式</title>
</head>
<body bgcolor = "red" background = "img/1.img">
<!--bgcolor 背景色 background 背景图片-->
</body>
</html>
2. Picture
pictures and background images are different, one is the background, one can move things on a page
1.设置图片宽度和高度的时候，只设置宽度，高度会进行等比例缩放。
2.Img标签就是图片标签
3.src属性是图片的路径
4.width设置宽度,height设置高度
5.title是设置鼠标悬停上显示的字
6.alt 图片加载失败的时候显示的提醒信息，图片加载失败的原因可能有网速拥塞，或者在该路径下无法找到该图片
<img src="img/tiger.jpg"/ width = "100px" //可以设置宽度
title = "这是悬停提醒" alt = "图片找不到哦"/>
<br><br><br>
<img src="img/tiger.jpg"/>
<开始><结束/> 如果在一个标签开始和结束中间不加东西的话可以改写为如下
<测试/>
比如：<img></img> 如果在img标签中间不加东西的话 改写为 <img/>如上图所示
Hyperlinks
features:
underlined
the shape of a small hand hovering above is displayed in the hyperlink
href: hot reference thermal reference
href attribute must have been behind the address of a resource can be a URL, a picture
can be an absolute path, the path may be a relative, can be a network resource, it may also be local
<Target = "_blank">: New window click on the hyperlink will open a new page
<Target = "_self">: the current window (this is the default mode) will go to the linked resources from the current web page window
<Target = "_top">: top-level window
<Target = "_parent">: parent window
Hyperlink action
may send a request from the browser a hyperlink to the server
the browser sends a request (request: request)
the server transmits data (response: response) to the browser
B / S structure: are each corresponding to a response to a request
B- Request -> S
S response ----- -----> B
用户点击超链接和用户在浏览器地址栏上直接输入URL，有何区别？
本质上没有区别，都是向服务器发送请求
从操作上来说，超链接使用更加方便
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<!--以下为超链接的使用-->
<a href = "链接的地址 如http://www.baidu.com">百度</a>
<a href = "www.hao123/com" target = "_blank"><img src = "图片路径"/><a/>放入一个图片超链接
</body>
</html>
List (understand the content)
