jQuery(八):属性操作

一、获取或设置元素的属性值

attr()获取或设置匹配元素的属性值,语法如下:

获取元素属性值示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>属性操作</title>
    <style>
      *{
          margin: 0px;
          padding: 0px;
      }
      td{
          width: 100px;
          border: 1px solid #cccccc;
          cursor: pointer;
      }
    </style>
    <!--引入jQuery-->
    <script src="../jquery-3.3.1.js"></script>
    <!--javascript-->
    <script>
       $(function(){
           $("img").click(function(){
              // 获取属性的值
              alert($("img").attr("src")) ;              
           });          
       });
    </script>
</head>
<body>
    <img src="../qq.jpg" />
</body>
</html>

 

效果:

设置单个元素属性值示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>属性操作</title>
    <style>
      *{
          margin: 0px;
          padding: 0px;
      }
      td{
          width: 100px;
          border: 1px solid #cccccc;
          cursor: pointer;
      }
    </style>
    <!--引入jQuery-->
    <script src="../jquery-3.3.1.js"></script>
    <!--javascript-->
    <script>
       $(function(){
           $("img").click(function(){
              // 获取属性的值
              //alert($("img").attr("src")) ; 

              // 添加单个属性
              $("img").attr("alt","QQ斗地主"); 
              alert($("img").attr("alt")) ;             
           });          
       });
    </script>
</head>
<body>
    <img src="../qq.jpg" />
</body>
</html>

 

效果:

添加多个属性值示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>属性操作</title>
    <style>
      *{
          margin: 0px;
          padding: 0px;
      }
      td{
          width: 100px;
          border: 1px solid #cccccc;
          cursor: pointer;
      }
    </style>
    <!--引入jQuery-->
    <script src="../jquery-3.3.1.js"></script>
    <!--javascript-->
    <script>
       $(function(){
           $("img").click(function(){
              // 获取属性的值
              //alert($("img").attr("src")) ; 

              // 添加单个属性
              //$("img").attr("alt","QQ斗地主"); 
              //alert($("img").attr("alt")) ;

              // 添加多个属性
              $("img").attr({"alt":"QQ斗地主","title":"斗地主"}); 
              console.log($(this).attr("alt")); 
              console.log($(this).attr("title"));            
           });          
       });
    </script>
</head>
<body>
    <img src="../qq.jpg" />
</body>
</html>

 

效果:

二、删除属性值

removeAttr()匹配的元素中删除一个属性,语法如下:

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>属性操作</title>
    <style>
      *{
          margin: 0px;
          padding: 0px;
      }
      td{
          width: 100px;
          border: 1px solid #cccccc;
          cursor: pointer;
      }
    </style>
    <!--引入jQuery-->
    <script src="../jquery-3.3.1.js"></script>
    <!--javascript-->
    <script>
       $(function(){
           $("img").click(function(){
              // 获取属性的值
              //alert($("img").attr("src")) ; 

              // 添加单个属性
              //$("img").attr("alt","QQ斗地主"); 
              //alert($("img").attr("alt")) ;

              // 添加多个属性
              //$("img").attr({"alt":"QQ斗地主","title":"斗地主"}); 
              //console.log($(this).attr("alt")); 
              //console.log($(this).attr("title")); 

              // 删除属性
              $(this).removeAttr("src");           
           });          
       });
    </script>
</head>
<body>
    <img src="../qq.jpg" />
</body>
</html>

 

效果:

 

posted @ 2018-10-01 23:22  .NET开发菜鸟  阅读(207)  评论(0编辑  收藏  举报