自己实现顶部导航布局--内容显示
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>test</title> ???<style> ???????body{ ???????????margin: 0px; ???????????padding: 0; ???????} ???????.app{ ???????????height: 400px; ???????????width: 400px; ???????????background-color: gray; ???????????padding-top: 40px; ???????} ???????.app01{ ???????????width: 400px; ???????????height: 40px; ???????????background-color: green; ???????????position: fixed; ???????????left: 0; ???????????top: 0; ???????} ???</style></head><body><div class="app"> ???<div class="app01"> ???????头部导航 ???</div> ???<div class="content"> ???????content ???</div></div></body></html>app内容区布局思路也一样的
[js]顶部导航和内容区布局
原文地址：https://www.cnblogs.com/iiiiiher/p/9974820.html