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  • jquery(3)常用方法 fly

    $()下的常用方法:

    1、has();

    2、not();

    3、filter();

    4、next();

    5、prev();

    6、find();

    7、eq();

    8、index();

    9、attr(); 

    1-2-3:

    代码1:

     

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         //filter:过滤
     9         //not:与filter相反
    10         $(function (){
    11             $('div').filter('.box').css('background','red');
    12             //$('div').not('.box').css('background','red');
    13         });
    14     </script>
    15 </head>
    16 <body>
    17     <div class="box"/>div1</div>
    18     <div>div2</div>
    19     <div>div3</div>
    20 </body>
    21 
    22 </html> 

    运行效果依次如下:

      filter:

    not:

    代码2:

      has:包含

      

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         //has:包含
     9         $(function (){
    10             $('div').has('span').css('background','blue');//找到div下包含span标签的元素
    11         });
    12     </script>
    13 </head>
    14 <body>
    15     <div class="box"/>div1<span>span</span></div>
    16     <div>div2</div>
    17     <div>div3</div>
    18 </body>
    19 
    20 </html> 

    运行效果:

      

    两者区别:filter、not针对的是当前元素,has针对的是当前元素里面的元素

    代码3:

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         //has:包含
     9         $(function (){
    10             $('div').has('.box').css('background','blue');
    11         });//找到div中的class为box的span元素
    12     </script>
    13 </head>
    14 <body>
    15     <div class="box"/>div1<span class="box">span</span></div>
    16     <div class="box">div2</div>
    17     <div>div3</div>
    18 </body>
    19 
    20 </html> 

     运行效果:

    4-5:

    next:下一个元素

    prev:上一个元素

    代码4:

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         $(function (){
     9             $('div').next().css('background','green');//找到div节点的下一个元素
    10             //$('p').prev().css('background','red');
    11         });
    12     </script>
    13 </head>
    14 <body>
    15     <div>div</div>
    16     <span>span</span>
    17     <p>p</p>
    18 </body>
    19 
    20 </html> 

    运行效果:

    6-

    find:查找元素内部包含的元素

    代码5:

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         $(function (){
     9             $('div').find('h2').css('background','orange');
    10         });
    11     </script>
    12 </head>
    13 <body>
    14     <div>
    15         <h3>h3</h3>
    16         <h3>h3</h3>
    17         <h2>h2</h2>
    18         <h3>h3</h3>
    19         <h2>h2</h2>
    20         <h3>h3</h3>
    21     </div>
    22     
    23 </body>
    24 
    25 </html> 

    运行效果:

      

    7、eq();--一组元素的第几个(下标)

    代码6:

      

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         $(function (){
     9             $('div').find('h2').eq(1).css('background','orange');//选择h2中下标为1的元素
    10         });
    11     </script>
    12 </head>
    13 <body>
    14     <div>
    15         <h3>h3</h3>
    16         <h3>h3</h3>
    17         <h2>h2</h2>
    18         <h3>h3</h3>
    19         <h2>h2</h2>
    20         <h3>h3</h3>
    21     </div>
    22     
    23 </body>
    24 
    25 </html> 

    运行效果:

      

    8、index();--索引

      代码7:

      

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         $(function (){
     9             alert($('#h').index());//索引就是当前元素在所有兄弟节点中的位置
    10         });
    11     </script>
    12 </head>
    13 <body>
    14     <div>
    15         <h3>h3</h3>
    16         <h3>h3</h3>
    17         <h2>h2</h2>
    18         <h3 id="h">h3</h3>
    19         <h2>h2</h2>
    20         <h3>h3</h3>
    21     </div>
    22     
    23 </body>
    24 
    25 </html> 

    运行效果:

      

    代码9:

    attr();

     1 <!DOCTYPE html>
     2 <html lang="en">
     3 <head>
     4     <meta charset="UTF-8">
     5     <title>Title</title>
     6     <script src="jquery-1.10.1.min.js"></script>
     7     <script>
     8         $(function (){
     9             //alert($('div').attr('title'));//一个参数获取属性值
    10     
    11             $('div').attr('title','456');//两个参数设置属性值
    12             
    13             $('div').attr('class','box');//设置类属性值为box。
    14         });
    15     </script>
    16 </head>
    17 <body>
    18     <div title="123">div</div>
    19 </body>
    20 
    21 </html> 

    运行效果:

    jquery常用方法完毕。

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  • 原文地址:https://www.cnblogs.com/flytime/p/6855801.html
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