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Home > List of blog posts > jq 选择器，属性选择器，子类选择器，表单选择器
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jq 选择器，属性选择器，子类选择器，表单选择器
张浩刚
Original
1363 people have browsed it
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <meta http-equiv="X-UA-Compatible" content="ie=edge">
  7.     <title>Document</title>
  8. <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
  9. </head>
  10. <body>
  12. <ul>
  13.     <li>list item 1</li>
  14.     <li class='twor'>list item 2</li>
  15.     <li id='three' name='three'>list item 3</li>
  16.     <li class='four'>list item 4</li>
  17.     <li name='five'>list item 5</li>
  18.     <li name='haha man'><span>list item 6</span></li>
  19.     <li name='ffic'>list item 7</li>
  20. </ul>
  21. <ul>
  22.     <li>list item 1</li>
  23. </ul>
  24. <button>点击</button>
  25.     <script>
  26.         $('button').on('click', function(){
  27.             // $('li:odd').css('color','red');//选中偶数
  28.             // $('li:even').css('color','red');//选中奇数
  29.             // $('li:eq(1)').css('color','red'); //从0开始，1即为第二个
  30.             // $('li:gt(2)').css('color','red');//选中起始位以后的所有li
  32.             // $('li[id]').css('color','red'); //选中li下所有含id属性的li
  33.             // $('li[id="three"]').css('color','red'); //选中id=three的li
  34.             // $('li[class="four"]').css('color','red'); //选中class=four的li
  35.             // $('li[name="five"]').css('color','red'); //选中name=five的li
  36.             // $('li[name^="f"]').css('color','red'); //选中name属性中开头为f的li
  37.             // $('li[class$="r"]').css('color','red'); //选中class属性中结尾为r的li
  38.             // $('li[class*="r"]').css('color','red'); //class属性中只要有r的就都选中
  39.             // $('li[name~="man"]').css('color','red'); //选中name属性中有空的 man的li
  40.             // $('li[id][name^="t"]').css('color','red'); //多重属性筛选 ，选中所有含id的且name开头为t的li
  42.             // $('li:first').css('color','red'); //第一个
  43.             // $('li:first-child').css('color','red');//第一个
  44.             // $('li:first-of-type').css('color','red');//第一个
  46.             // $('li:last').css('backgroundColor','blue');//最后一个
  47.             // $('li:last-of-type').css('color','red');//最后一个
  48.             // $('li:last-child').css('color','red');//最后一个
  49.             // $('li:nth-child(2)').css('color','red'); //第二个
  50.             // $('li:nth-of-type(2)').css('color','red'); //第二个
  51.         });
  52.     </script>
  53. </body>
  54. </html>

from选中

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <meta http-equiv="X-UA-Compatible" content="ie=edge">
  8.     <title>Document</title>
  9.     <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
  10. </head>
  12. <body>
  13.     <form action="" method="GET">
  14.         <p><label for="text">会员名：<input type="text" name="text" id="text"></label></p>
  15.         <p><label for="password">登录密码<input type="password" name="password" id="password"></label></p>
  16.         <p><label for="re_password">再次密码<input type="password" name="password" id="re_password"></label></p>
  17.         <p>
  18.             <label for="sex1">性别：
  19.                 <label for="sex1"><input type="radio" name="sex" id="sex1" value='1'>男</label>
  20.                 <label for="sex2"><input type="radio" name="sex" id="sex2" value="0">女</label>
  21.             </label>
  22.         </p>
  23.         <p>
  24.             <label for="php">爱好：
  25.                 <label for="php"><input type="checkbox" name="check" id="php">php</label>
  26.                 <label for="javascript"><input type="checkbox" name="check" id="javascript">javascript</label>
  27.                 <label for="css"><input type="checkbox" name="check" id="css">css</label>
  28.                 <label for="python"><input type="checkbox" name="check" id="python" disabled>python</label>
  29.             </label>
  30.         </p>
  31.         <p>
  32.             <label for="">地区
  33.                 <select>
  34.                     <option value="郫都区">郫都区</option>
  35.                     <option value="锦江区">锦江区</option>
  36.                     <option value="青羊区">青羊区</option>
  37.                     <option value="高新区">高新区</option>
  38.                 </select>
  39.             </label>
  40.         </p>
  41.         <button>点击</button>
  42.     </form>
  43.     <script>
  44.         $('button').on('click', function () {
  45.             if (!$('#text').val()) {
  46.                 alert('用户名不能为空');
  47.                 return false;
  48.             }
  49.             if (!$('input[name="password"]').val() || $('input[name="password"]').val() !== $('#re_password').val()) {
  50.                 alert('密码不能为空，或不相等');
  51.                 return false;
  52.             }
  53.             let sex = $('input[name="sex"]:checked').val();
  54.             if( !sex ){
  55.                 alert('请选择性别');
  56.                 return false;
  57.             }
  58.             let select = $('input[name="check"]:checked').val();
  59.             if( !select ){
  60.                 alert('请选择爱好');
  61.                 return false;
  62.             }
  63.             //获取shelect
  64.             //$('select option:checked').val(); //获取选中的值，option中的value
  65.             //$('select option:checked').text; // 选中option的汉字
  66.         });
  67.     </script>
  68. </body>
  70. </html>
Correcting teacher：西门大官人西门大官人

Correction status：qualified

Teacher's comments：
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