如何在jQuery中检查一个元素是否被隐藏

要检查一个元素是否被隐藏，可以使用jQuery :hidden选择器。.toggle()函数是用来切换一个元素的可见性。

语法:

$(element).is(":hidden");

示例:

<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="utf-8">
    <title>
        Jquery Hidden element Checking
    </title>
    <style>
        h1 {
            color: green;
        }
          
        table,
        th,
        td {
            border: 1px solid black;
        }
    </style>
    <script src=
"https://code.jquery.com/jquery-1.12.4.min.js">
    </script>
    
    <script type="text/javascript">
         $(document).ready(function() {$ ("button").click(function() {
                 $("table").toggle("slow", function() { if ($ ("table").is(":hidden")) {
  
                        alert(" Hidden Element.");
                    } else {
                        alert("Element Visible.");
                    }
                });
            });
        });
    </script>
</head>
  
<body>
    <center>
        <h1>Geeks for Geeks</h1>
        <button type="button">
            Click!
        </button>
        <table style="width:60%">
            <tr>
                <th>Language Index</th>
                <th>Language Name</th>
            </tr>
            <tr>
                <td>1</td>
                <td>C</td>
            </tr>
            <tr>
                <td>2</td>
                <td>C++</td>
            </tr>
            <tr>
                <td>3</td>
                <td>Java</td>
            </tr>
            <tr>
                <td>4</td>
                <td>Python</td>
            </tr>
            <tr>
                <td>5</td>
                <td>HTML</td>
            </tr>
        </table>
    </center>
</body>
  
</html>

输出:
点击前:
如何在jQuery中检查一个元素是否被隐藏？