css参考文档 http://www.java1234.com/a/javaziliao/shuji/2013/1230/1345.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <style> #div1{ width: 200px; height: 100px; background: blue; } #div2{ width: 200px; height: 300px; background: red; } #div3{ width: 200px; height: 200px; background: orange; } </style> <body> <div id="div1"></div> <div id="div2"></div> <div id="div3"></div> </body> </html>
代码与实践效分析
1、div是块状元素,相当的霸道,独占一行,如果不设置div的宽度,会铺满整行;块状元素不允许其他元素和它处于同一行
2、div与div的前后顺序与代码前后顺序一致;
3、div与div之间无缝连接;
总结:
网页布局从大处着眼,先整体再局部!