1.font-weight:bold; 字体变粗
2.text-align:center; 字体的文本居中
3.display:none; 隐藏
4.position:absolute; 绝对定位
5.opacity:0.3 透明
6.submit 提交表单
7.method="get" 提交表单
8.border-collapse:collapse; 边框合起来
9. 下拉框
10. 下拉框的选项 最重要两个值 text(innerHTML)和value text给用户看 value是数据库id
11.text-decoration:none 去掉下划线
12.a:hover(写在样式表外面) 鼠标移到超链接上
13.list-style-type:none 去掉li那个点
14.display:inline 成行显示(变成行级元素)
15.position:relative 相对定位
16.cursor:pointer 鼠标移动到上面变成手的样子(让用户知道可以点击)
17.background:url("") 可以样式设置路径
18.19.

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