如何使用jQuery滚动窗口

给定一个HTML文档，任务是在jQuery的帮助下滚动该文档。有两种方法可以滚动HTML文档的窗口，下面将讨论。

方法:

通过使用选择器选择文件。
使用scrollTop()或scrollTo()方法，将文档移动到该位置。

实例1：本实例使用scrollTop()方法滚动HTML文档。

<!DOCTYPE HTML>  
<html>  
  
<head> 
    <title> 
        How to scroll window using jQuery ?
    </title>
      
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
    </script>
      
    <style>
        #body {
            height: 1000px;
        }
    </style>
</head> 
  
<body style = "text-align:center;" id = "body">  
      
    <h1 id = "h1" style = "color:green;" >  
        GeeksForGeeks  
    </h1>
      
    <p id = "GFG_UP" style =
        "font-size: 15px; font-weight: bold;">
    </p>
      
    <button onclick = "gfg_Run()"> 
        Click here
    
      
    <p id = "GFG_DOWN" style = 
        "font-size: 23px; font-weight: bold; color: green; ">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
          
        el_up.innerHTML = "Click on the button to scroll"
                        + " the document.";
          
        function gfg_Run() {
            $(document).scrollTop(100);
            el_down.innerHTML = "Position has been set.";
        }         
    </script> 
</body>  
  
</html>

输出:

在点击按钮之前。
点击该按钮后。

例子2：这个例子使用scrollTo()方法滚动HTML文档。

<!DOCTYPE HTML>  
<html>  
  
<head> 
    <title> 
        How to scroll window using jQuery ?
    </title>
      
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
    </script>
      
    <style>
        #body {
            height: 1000px;
        }
    </style>
</head> 
  
<body style = "text-align:center;" id = "body">  
      
    <h1 id = "h1" style = "color:green;" >  
        GeeksForGeeks  
    </h1>
      
    <p id = "GFG_UP" style =
        "font-size: 15px; font-weight: bold;">
    </p>
      
    <button onclick = "gfg_Run()"> 
        Click here
    
      
    <p id = "GFG_DOWN" style = 
        "font-size: 23px; font-weight: bold; color: green; ">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
          
        el_up.innerHTML = "Click on the button to scroll"
                        + " the document.";
          
        function gfg_Run() {
            window.scrollTo(0, 100);
            el_down.innerHTML = "Position has been set.";
        }         
    </script> 
</body>  
  
</html>

输出: