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自己写的一段jquery实现当滚动条滑动到某个位置实现向中间移动

js三个小事件：

<html>

    <head>
        <meta charset="UTF-8">
        <script type="text/javascript" src="js/jquery.js"></script>
        <script type="text/javascript">
            $(document).ready(function() {
                $(".btn1").click(function() {
                    alert($("div").scrollTop() + " px");
                });
            });
        </script>
    </head>

    <body>
        <div style="border:1px solid black;200px;height:200px;overflow:auto">
            This is some text. 
This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.
 This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.
 This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.
 This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.
 This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.
        </div>
        <button class="btn1">获得 scrollbar top offset</button>
        <p>试着移动滚动条，然后再次点击按钮。</p>
    </body>

</html>

<html>

    <head>
        <meta charset="UTF-8">
        <script type="text/javascript" src="js/jquery.js"></script>
        <script type="text/javascript">
            x = 0;
            $(document).ready(function() {        //让网页全部加载完成后执行一个函数
                $("div").scroll(function() {
                    $("span").text(x += 1);
                });
                $("button").click(function() {
                    $("div").scroll();
                });
            });
        </script>
    </head>

    <body>
        <p>请试着滚动 DIV 中的文本：</p>
        <div style="200px;height:100px;overflow:scroll;">

text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text.
            <br /><br /> text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. text. 
text. text. text. text. text. text. text. text. text. text. text. text. text. text. text.</div>
        <p>滚动了 <span>0</span> 次。</p>
        <button>触发窗口的 scroll 事件</button>
    </body>

</html>

<html>

    <head>
        <script type="text/javascript" src="js/jquery.js"></script>
        <script type="text/javascript">
            $(document).ready(function() {
                $(".btn1").click(function() {
                    $("p").animate({
                        marginLeft: "100px"
                    });
                });
                $(".btn2").click(function() {
                    $("p").animate({
                        marginLeft: ""
                    });
                });
            });
        </script>
    </head>

    <body>
        <p style="background-color:yellow">This is a paragraph.</p>
        <button class="btn1">Animate</button>
        <button class="btn2">Reset</button>
    </body>

</html>

实现回调函数：（一个涉及动画的函数之后来执行语句）

$("p").hide(1000,function(){
　　alert("The paragraph is now hidden");
});

自己写的：

<script type="text/javascript">
//    $(document).ready(function() {       
//        $(window).scroll(function() {
//            
//            alert($(window).scrollTop() + " px"); 
//                
//            }

    $(document).ready(function() {       
        $(window).scroll(function() {
            
            if(($(window).scrollTop()) > 500){
                $(".f_a").animate({marginLeft: "0px",opacity:'1',speed:"1500"}, function(){
                    $(".f_aa").animate({
                        marginLeft: "0px",
                        opacity:'1',
                        speed: "slow"
                    },2000);
                });
            }
            

            
            if(($(window).scrollTop()) > 500){
                $(".f_b").animate({marginRight: "0px",opacity:'1'},function(){
                    $(".f_bb").animate({
                        marginRight: "0px",
                        opacity:'1'
                    },2000);
                });
            }
            
            
//            $("p").hide(1000,function(){
//                alert("The paragraph is now hidden");
//            });
            
            
            
            if(($(window).scrollTop()) > 1800){
                $(".f_c").animate({marginLeft: "0px",opacity:'1'},function(){
                    $(".f_cc").animate({
                        marginLeft: "0px",
                        opacity:'1'
                    },2000);
                });
            }
            
            
            if(($(window).scrollTop()) > 1800){
                $(".f_d").animate({marginRight: "0px",opacity:'1'},function(){
                    $(".f_dd").animate({
                        marginRight: "0px",
                        opacity:'1'
                    },2000);
                });
            }
            
            
//            if(($(window).scrollTop()) > 3200){
//                $(".f_e").animate({
//                        marginTop: "40px",
//                        opacity:'1'
//                    });
//            }
            
            
            if(($(window).scrollTop()) > 3200){
                $(".f_e").animate({marginTop: "40px",opacity:'1'},function(){
                    $(".f_ee").animate({marginTop: "40px",opacity:'1'},function(){
                        $(".f_eee").animate({
                            marginTop: "40px",
                            opacity:'1'
                        });
                    });
                });
            }
            

            if(($(window).scrollTop()) > 4100){
                $(".f_f").animate({
                        marginTop: "40px",
                        opacity:'1'
                    });
            }

        });
        
    });

</script>

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原文地址：https://www.cnblogs.com/shandayuan/p/9238664.html