一丶盒模型的屬性(重要) 1.padding padding是標準文檔流,父子之間調整位置 <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>padding</title> <style> *{ padding: 0; margi ...
一丶盒模型的屬性(重要)
1.padding
padding是標準文檔流,父子之間調整位置
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>padding</title> <style> *{ padding: 0; margin: 0; } .box{ width: 200px; height: 200px; background-color: red; /*上下左右*/ padding: 10px; /*上下 左右*/ padding: 20px 30px; /*上 左右 下*/ padding: 20px 30px 40px; /*順時針 上右下左*/ padding: 20px 30px 40px 50px; } </style> </head> <body> <div class="box">alex</div> </body> </html>padding
2.border
三要素: 線性的寬度 線性的樣式 顏色
solid 實線 dotted小圓點 double雙實線 bottom虛線
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>border</title> <style> *{ padding: 0; margin: 0; } .box{ width: 200px; height: 200px; background-color: red; /*根據方向來設置*/ border-left: 5px solid green; border-right: 1px dotted yellow; border-top: 5px double purple; border-bottom: 1px dashed; } </style> </head> <body> <div class="box">alex</div> </body> </html>border
實例:製作三角形
transparent 透明
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>製作三角形</title> <style type="text/css"> div{ width: 0; height: 0; border-bottom: 20px solid red; border-left: 20px solid transparent; border-right: 20px solid transparent; } </style> </head> <body> <div> </div> </body> </html>製作三角形
3.margin
前提:必須是在標準文檔流下
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>margin</title> <style> .s1{ background-color: red; margin-right: 30px; } .s2{ background-color: rgb(0,128,0); margin-left: 30px; } </style> </head> <body> <span class="s1">alex</span><span class="s2">wusir</span> </body> </html>margin
margin垂直方向上的坑:
margin的水平不會出現任何問題
垂直方向上 margin會出現'塌陷問題'
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>margin坑</title> <style> .s1{ width: 200px; height: 200px; background-color: red; margin-bottom: 40px; } .s2{ width: 200px; height: 200px; background-color: green; margin-top: 100px; } </style> </head> <body> <div class="s1"></div> <div class="s2"></div> </body> </html>margin(坑)
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>margin父子盒子的坑</title> <style type="text/css"> .box{ width: 300px; height: 300px; background-color: red; /*float: left;*/ } .child{ width: 100px; height: 100px; background-color: green; margin-left: 50px; margin-top: 50px; } </style> </head> <body> <div class="father"> <div class="child"> </div> </div> </body> </html>margin父子盒子的坑
二丶display顯示
前提;必須是在標準文檔流下
塊級元素和行內元素的相互轉換:
塊級元素可以轉換為行內元素:
display:inline
此時這個div不能設置寬度丶高度;
此時這個div可以和別人併排了
行內元素轉換為塊級元素:
display:block
此時這個span能夠設置寬高
此時這個span必須霸占一行了,別人無法和他併排
如果不設置寬度,將撐滿父親
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>display</title> <style> .box{ width: 100px; height: 100px; background-color: red; border: 1px solid yellow; } div a{ display: block; width: 100px; height: 100px; } span{ display: inline-block; width: 300px; height: 200px; background-color: yellow; } </style> </head> <body> <div class="box">alex</div> <div class="box">wusir</div> <div> <a href="#"> <img src="http://img07.tooopen.com/images/20170818/tooopen_sy_220999936848.jpg" alt="" width="300" height="300"/> </a> </div> <input type="text" /><br /> <span>哈哈哈哈</span> <span>嘻嘻嘻嘻</span> </body> </html>display
三丶浮動
float : none 表示不浮動,預設
left:表示左浮動
right:表示右浮動
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>浮動</title> <style> *{ padding: 0; margin: 0; } .father{ width: 500px; } .box1{ width: 100px; height: 100px; background-color:red; float: left; } .box2{ width: 100px; height: 300px; background-color:green; float: left; } .box3{ width: 100px; height: 100px; background-color:blue; float: left; } .father2{ width: 600px; height: 200px; background-color: yellow; } </style> </head> <body> <div class="father"> <div class="box1">1</div> <div class="box2">2</div> <div class="box3">3</div> </div> <div class="father2"> </div> </body> </html>浮動
我們該如何清除浮動呢?有以下幾種方法
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>清除浮動</title> <style> *{ padding: 0; margin: 0; } .father{ width: 500px; height: 300px; } .box1{ width: 100px; height: 100px; background-color:red; float: left; } .box2{ width: 100px; height: 300px; background-color:green; float: left; } .box3{ width: 100px; height: 100px; background-color:blue; float: left; } .father2{ width: 600px; height: 200px; background-color: yellow; } </style> </head> <body> <div class="father"> <div class="box1">1</div> <div class="box2">2</div> <
