当前位置:Gxlcms > JavaScript > jQuery中focusin()与focus()以及find()于children()的区别

jQuery中focusin()与focus()以及find()于children()的区别

时间:2021-07-01 10:21:17 帮助过:5人阅读


jQuery中focus()和focusin()、focus()和children()的区别

focus()和focusin()

focus()和focusin()的区别在于focusin()支持事件的冒泡,下面举例说明:

<!doctype html><html lang="en"><head>
  <meta charset="utf-8">
  <title>focusin demo</title>
  <style>
  span {    display: none;  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js">
  </script>
  </head>
  <body>
  <p>
  <input type="text"> 
  <span>focusin fire</span>
  </p>
  <p>
  <input type="password"> 
  <span>focusin fire</span>
  </p>
  <script>$( "p" ).focusin(function() {
  $( this ).find( "span" ).css( "display", "inline" ).fadeOut( 1000 );
});</script>
</body>
</html>

当我们点击输入框时,其获得焦点,导致获得焦点事件向上冒泡,使得p标签触发获得焦点事件,而focus()并不支持事件冒泡,同样地,focusout()支持事件冒泡,而blur()不支持。

find()和children()

find()和children()的区别在于find()向下追溯多级子节点,而children()只向下追溯一级子节点。find()和children()相同的地方是他们在寻找子节点时都不包含自身节点。

<!DOCTYPE html><html lang="en"><head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        p{            
        font-size: 20px;            
        width: 200px;            
        color: blue;            
        font-weight: bold;            
        margin: 0 10px;          
        }
          .hilite {            
          background: yellow;          
          }
    #test{        
    font-weight: bolder;    
    }
    </style>
    </head>
    <body>
    <ul class="level-1">
  <li class="item-i">I</li>
  <li class="item-ii">II    
  <ul class="level-2">
      <li class="item-a">A</li>
      <li class="item-b">B        
      <ul class="level-3">
          <li class="item-1">1</li>
          <li class="item-2">2</li>
          <li class="item-3">3</li>
        </ul>
      </li>
      <li class="item-c">C</li>
    </ul>
  </li>
  <li class="item-iii">III</li></ul>
    <script src="jquery-2.1.4.js"></script>
    <script>
        $( "li.item-ii" ).find( "li" ).css( "background-color", "red" );    
        </script>
        </body>
        </html>

倘若将上例中的find()替换为children(),会得到不同的结果。

以上就是jQuery中focusin()与focus()以及find()于children()的区别的详细内容,更多请关注Gxl网其它相关文章!

人气教程排行