邊框
border:邊框的意思,描述盒子的邊框
邊框有三個要素: 粗細 線性樣式 顏色
border: solid
border特性
如果顏色不寫,默認是黑色。如果粗細不寫,不顯示邊框。如果只寫線性樣式,默認的有上下左右 3px的寬度,實體樣式,並且黑色的邊框。
通常使用簡寫方式
border :solid 5px red;
線性樣式 粗細 顏色
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> <style type="text/css"> .box{ width: 200px; height: 200px; border:solid 5px red; } </style> </head> <body> <div class="box"></div> </body> </html>
如果顏色不寫,默認是黑色
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> <style type="text/css"> .box{ width: 200px; height: 200px; border:solid 5px; } </style> </head> <body> <div class="box"></div> </body> </html>
如果只寫線性樣式,默認的有上下左右 3px的寬度,實體樣式,並且黑色的邊框。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> <style type="text/css"> .box{ width: 200px; height: 200px; border:solid ; } </style> </head> <body> <div class="box"></div> </body> </html>
border寫法還可以分開寫
按照3要素來寫border
3個要素 粗細 線性樣式 顏色
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> <style type="text/css"> .box{ width: 200px; height: 200px; /*border: 5px solid red;*/ /* 按照3要素*/ border-width: 5px; border-style: solid; border-color: red; } </style> </head> <body> <div class="box"></div> </body> </html>
等於 border: 5px solid red
border-width: 3px;
border-style: solid;
border-color: red;
后面可以繼續寫,方向和padding一樣 上右下左
border-width: 5px 10px; /* 上下 左右*/ border-style: solid dotted double dashed; /* 上右下左 */ border-color: red green yellow; /* 上 左右 下 */
按照方向划分
四個方向
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> <style type="text/css"> .box{ width: 200px; height: 200px; /* 按照方向划分*/ border-top-width: 10px; border-top-style: solid; border-top-color: red; border-right-width: 10px; border-right-style: solid; border-right-color: red; border-bottom-width: 10px; border-bottom-style: solid; border-bottom-color: red; border-left-width: 10px; border-left-style: solid; border-left-color: red; } </style> </head> <body> <div class="box"></div> </body> </html>
上面12條語句,相當於 bordr: 10px solid red;
另外還可以這樣寫法 效果一樣:
border-top: 10px solid red;
border-right: 10px solid red;
border-bottom: 10px solid red;
border-left: 10px solid red;
清除border邊框的默認樣式,比如input輸入框
border:none;
border:0;
設置一個方向沒有
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="x-ua-compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Title</title> <style type="text/css"> .box{ width: 200px; height: 200px; border-top: 10px solid red; border-right: 10px solid red; border-bottom: 10px solid red; border-left: 10px solid red; /* 設置border沒有樣式*/ border-left: none; } </style> </head> <body> <div class="box"></div> </body> </html>
border-left: 0; 也可以
border-left: 0;
邊框樣式
值 | 描述 |
---|---|
none | 無邊框。 |
dotted | 點狀虛線邊框。 |
dashed | 矩形虛線邊框。 |
solid | 實線邊框。 |