filter（fn ）

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2023-12-01

描述 (Description)

filter( fn )方法过滤与指定函数不匹配的匹配元素集中的所有元素。

语法 (Syntax)

以下是使用此方法的简单语法 -

<i>selector</i>.filter( selector )

参数 (Parameters)

以下是此方法使用的所有参数的说明 -

fn - 使用与$.each类似的当前元素$.each 。如果函数返回false，则删除元素，否则保留元素。

例子 (Example)

以下示例显示了此方法的简单用法 -

<html>
   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript" 
         src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
      </script>
      <script type = "text/javascript" language = "javascript">
         $(document).ready(function() {
            $("li").filter(function (index) {
               return index == 1 || $(this).attr("class") == "middle";
            }).addClass("selected");
         });
      </script>
      <style>
         .selected { color:red; }
      </style>
   </head>
   <body>
      <div>
         <ul>
            <li class = "top">list item 1</li>
            <li class = "top">list item 2</li>
            <li class = "middle">list item 3</li>
            <li class = "middle">list item 4</li>
            <li class = "bottom">list item 5</li>
            <li class = "bottom">list item 6</li>
         </ul>
      </div>
   </body>
</html>

例子 (Example)

以下示例显示了此方法的简单用法 -

<html>
   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript" 
         src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
      </script>
      <script type = "text/javascript" language = "javascript">
         $(document).ready(function() {
            $("li").filter(function (index) {
               return index == 1 || $(this).attr("class") == "middle";
            }).addClass("selected");
         });
      </script>
      <style>
         .selected { color:red; }
      </style>
   </head>
   <body>
      <div>
         <ul>
            <li class = "top">list item 1</li>
            <li class = "selected">list item 2</li>
            <li class = "selected">list item 3</li>
            <li class = "selected">list item 4</li>
            <li class = "bottom">list item 5</li>
            <li class = "bottom">list item 6</li>
         </ul>
      </div>
   </body>
</html>