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Home > List of blog posts > 实例演示$()函数的四个参数，联系将课堂上提及的所有getter/setter方法
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实例演示$()函数的四个参数，联系将课堂上提及的所有getter/setter方法
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$()函数的四个参数

1. $(选择器,上下文): 获取元素

jQuery([selector,[context]])

  1. <!DOCTYPE html>
  2. <!DOCTYPE html>
  3. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
  9. </head>
  10. <body>
  11. 中国一定强
  12. <div  class="title"><h2>h2选择器</h2></div>
  13. <script>
  15. $("body").css('color','cyan');
  16. $('body').css("backgroundColor",'yellow');
  17. $(".title  h2").css('color','red');
  18. $(".title  h2").css('backgroundColor','green');
  20. </script>
  21. </body>
  22. </html>
2. $(js对象)
  1. <!DOCTYPE html>
  2. <!DOCTYPE html>
  3. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
  9. </head>
  10. <body>
  11. 中国一定强
  12. <div  class="title"><h2>h2选择器</h2></div>
  13. <script>
  14. $(document.body).css('color','cyan');
  15. $(document.body).css('backgroundColor','red');
  16. $(document.querySelector('.title h2')).css('backgroundColor','darkgreen');
  17. $(document.querySelector('.title h2')).css('color','#000');
  18. $(document.querySelectorAll('.title h2')).css('color','cyan');
  19. </script>
  20. </body>
  21. </html>
3.html标签字符
  1. <!DOCTYPE html>
  2. <!DOCTYPE html>
  3. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
  9. </head>
  10. <body>
  11. 中国一定强
  12. <div  class="title"><h2>h2选择器</h2></div>
  13. <script>
  14. $("<span>人都爱美丽</span>").appendTo(document.querySelector(".title  h2"));
  15. </script>
  16. </body>
  17. </html>
4.回调函数

$(function(){
// 文档就绪
});// $(document).ready() 的简写;当DOM加载完成后，执行其中的函数。

  1. <!DOCTYPE html>
  2. <!DOCTYPE html>
  3. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
  9. </head>
  10. <body>
  11. 中国一定强
  12. <div  class="title"><h2>h2选择器</h2></div>
  13. <script>
  14. $(function(){
  15. alert('加载完成');
  17. })
  18. </script>
  19. </body>
  20. </html>

联系将课堂上提及的所有getter/setter方法

  1. <!DOCTYPE html>
  2. <!DOCTYPE html>
  3. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
  9. </head>
  10. <body>
  11.     <ul>
  12.         <li>item1</li>
  13.         <li>item2</li>
  14.         <li>item3</li>
  15.         <li>item4</li>
  16.         <li>item5</li>
  17.       </ul>
  18. <h2></h2>
  19. <form   action="">
  20. <input    type="text"   name="user"  value="输入用户名">
  21. <input    type="password"   name="password"  value="123456">
  22. 保密:<input  type="radio"   name="xinxi"    value='保密'  checked>公开:<input  type="radio"   name="xinxi"    value='公开'>
  23. <button>提交</button>
  24. <p></p>
  25. </form>
  26. <script>
  27. $("body").css('color','cyan');
  28. $('<span>'+$("body").css('color')+'</span>').appendTo($('h2'));
  29. $('h2').attr('style',"color:red;display:block;width:300px;background-color:cyan");
  30. $('h2').html();
  31. $('h2').html("<p>通过html添加</p>");
  32. $('h2').text();
  33. $('h2').text('text设置文本').css('color',"blue").css('backgroundColor',"yellow");
  34. $('form').attr('action',function(){  return  'index.php?id=11';  })
  35. $('form')[0]===$('form').get(0);
  36. $('form  input[name=user]').val('设置的用户名').css('color','red');
  37. $('input[name=user]').val('设置的用户名').css('color','red');
  38. $('form  input[name="password"]').css('color','green').val();
  39. $('form  input[type="radio"]').attr('checked','');
  40. $('form  input[type="radio"]')[0].checked
  41. $('form  input[type="radio"]')[1].checked
  42. </script>
  43. </body>
  44. </html>

效果：

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：继续
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