HTML Style borderTopWidth用法及代码示例

HTML DOM中的Style borderTopWidth属性用于设置或返回元素顶部边框的宽度。

用法:

获取borderTopWidth属性
```
object.style.borderTopWidth
```

设置borderTopWidth属性

object.style.borderTopWidth = "thin | medium | thick | length |
initial | inherit"

属性值：

thin:这用于定义细边框。

例：

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <title> 
      DOM Style BorderTopWidth 
    </title> 
  
    <style> 
        .elem { 
            border-style:solid; 
            padding:10px; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color:green"> 
      GeeksforGeeks 
    </h1> 
    <b> 
      DOM Style BorderTopWidth 
    </b> 
    <p class="elem"> 
      GeeksforGeeks is a computer science 
      portal with a huge variety of well  
      written and explained computer  
      science and programming articles, 
      quizzes and interview questions. 
    </p> 
    <button onclick="changeWidth()"> 
      Change borderTopWidth 
    </button> 
  
    <!-- Script to change borderTopWidth -->
    <script> 
        function changeWidth() { 
            elem = document.querySelector('.elem'); 
            elem.style.borderTopWidth = 'thin'; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

thin-before

单击按钮后：

thin-after

medium:这用于定义中等顶部边框。这是默认值。

例：

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <title> 
      DOM Style BorderTopWidth 
    </title> 
    <style> 
        .elem { 
            border:thick solid; 
            padding:10px; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color:green"> 
      GeeksforGeeks 
    </h1> 
    <b> 
      DOM Style BorderTopWidth 
  </b> 
    <p class="elem"> 
      GeeksforGeeks is a computer  
      science portal with a huge  
      variety of well written and  
      explained computer science 
      and programming articles, 
      quizzes and interview questions. 
    </p> 
    <button onclick="changeWidth()"> 
      Change borderTopWidth 
    </button> 
  
    <!-- Script to change borderTopWidth -->
    <script> 
        function changeWidth() { 
            elem = document.querySelector('.elem'); 
            elem.style.borderTopWidth = 'medium'; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

medium-before

单击按钮后：

medium-after

thick:这用于定义粗大的顶部边框。

示例3：

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <title> 
      DOM Style BorderTopWidth 
    </title> 
  
    <style> 
        .elem { 
            border-style:solid; 
            padding:10px; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color:green"> 
      GeeksforGeeks 
    </h1> 
    <b> 
      DOM Style BorderTopWidth 
  </b> 
    <p class="elem"> 
      GeeksforGeeks is a computer  
      science portal with a huge  
      variety of well written and 
      explained computer science  
      and programming articles,  
      quizzes and interview questions. 
    </p> 
    <button onclick="changeWidth()"> 
      Change borderTopWidth 
    </button> 
  
    <!-- Script to change borderTopWidth -->
    <script> 
        function changeWidth() { 
            elem = document.querySelector('.elem'); 
            elem.style.borderTopWidth = 'thick'; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

thick-before

单击按钮后：

thick-after

length:这用于以长度单位定义顶部边框宽度。

示例4：

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <title> 
      DOM Style BorderTopWidth 
    </title> 
  
    <style> 
        .elem { 
            border-style:solid; 
            padding:10px; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color:green"> 
      GeeksforGeeks 
  </h1> 
    <b> 
      DOM Style BorderTopWidth 
    </b> 
    <p class="elem"> 
      GeeksforGeeks is a computer science 
      portal with a huge variety of well  
      written and explained computer science 
      and programming articles, quizzes and 
      interview questions. 
    </p> 
    <button onclick="changeWidth()"> 
      Change borderTopWidth 
    </button> 
  
    <!-- Script to change borderTopWidth -->
    <script> 
        function changeWidth() { 
            elem = document.querySelector('.elem'); 
            elem.style.borderTopWidth = '10px'; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：
length-before

单击按钮后：
length-after

initial:这用于将此属性设置为其默认值。

示例5：

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <title> 
      DOM Style BorderTopWidth 
    </title> 
  
    <style> 
        .elem { 
            border-style:solid; 
            padding:10px; 
            border-top-width:2px; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color:green"> 
      GeeksforGeeks 
    </h1> 
    <b> 
      DOM Style BorderTopWidth 
    </b> 
    <p class="elem"> 
      GeeksforGeeks is a computer science 
      portal with a huge variety of well  
      written and explained computer  
      science and programming articles, 
      quizzes and interview questions. 
    </p> 
    <button onclick="changeWidth()"> 
      Change borderTopWidth 
    </button> 
  
    <!-- Script to change borderTopWidth -->
    <script> 
        function changeWidth() { 
            elem = document.querySelector('.elem'); 
            elem.style.borderTopWidth = 'initial'; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

initial-before

单击按钮后：

initial-after

inherit:这将从其父项继承该属性。

示例6：

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <title> 
      DOM Style BorderTopWidth 
    </title> 
  
    <style> 
        #parent { 
            padding:10px; 
            border-style:solid; 
            /* Setting the borderTopWidth 
             of the parent */ 
            border-top-width:15px; 
        } 
          
        .elem { 
            border-style:solid; 
            padding:10px; 
        } 
    </style> 
</head> 
  
<body> 
    <h1 style="color:green"> 
      GeeksforGeeks 
    </h1> 
    <b> 
      DOM Style BorderTopWidth 
    </b> 
    <br> 
    <br> 
    <div id="parent"> 
        <p class="elem"> 
          GeeksforGeeks is a computer science  
          portal with a huge variety of well  
          written and explained computer science 
          and programming articles, quizzes and 
          interview questions. 
        </p> 
    </div> 
    <br> 
    <button onclick="changeWidth()"> 
      Change borderTopWidth 
    </button> 
  
    <!-- Script to change borderTopWidth -->
    <script> 
        function changeWidth() { 
            elem = document.querySelector('.elem'); 
            elem.style.borderTopWidth = 'inherit'; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

inherit-before

单击按钮后：

inherit-after

支持的浏览器：borderTopWidth属性支持的浏览器如下：

谷歌浏览器
IE浏览器
Firefox
Opera
苹果Safari

相关用法

注：本文由纯净天空筛选整理自sayantanm19大神的英文原创作品 HTML | DOM Style borderTopWidth Property。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。