CSS border-top-width 属性

描述

设置元素顶部边框的宽度。

可能的取值

**length ** - 任何长度单位。此属性的长度单位不能为负数。
**thin ** - 比设置为中等的边框更细的边框。
**medium ** - 比设置为细的边框更厚，比设置为粗的边框更薄的边框。
**thick ** - 比设置为中等的边框更厚的边框。

适用于

所有HTML元素。

DOM语法

object.style.borderTopWidth = "2px";

示例

以下是一个例子，展示了所有边框宽度：

<html>
   <head>
   </head>

   <body>
      <p style = "border-top-width:4px; border-style:solid;">
         This is a solid border whose width is 4px.
      </p>

      <p style = "border-top-width:4pt; border-style:solid;">
         This is a solid border whose width is 4pt.
      </p>

      <p style = "border-top-width:thin; border-style:solid;">
         This is a solid border whose width is thin.
      </p>

      <p style = "border-top-width:medium; border-style:solid;">
         This is a solid border whose width is medium;
      </p>

      <p style = "border-top-width:thick; border-style:solid;">
         This is a solid border whose width is thick.
      </p>

      <p style = "border-bottom-width:4px;
         border-top-width:10px;
         border-left-width: 2px;
         border-right-width:15px;
         border-style:solid;">
         This is a a border with four different width.
      </p>

   </body>
</html>