利用jquery制作滚动到指定位置触发动画

时间：2021-08-10 15:29:02
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>利用jquery制作滚动到指定位置触发动画</title>
    <script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script>
    <style type="text/css">

        * {
            margin: 0px;
            padding: 0px;
        }

        .gs {
            position: relative;
            top: 100px;
            font-weight:bold;">#099;
            left: 150px;
            width: 80px;
        }

        .xz {
            animation: roate 2s;
            animation-fill-mode: forwards;
            animation-direction: alternate;
        }

        .gs {
            float: left;
        }

        @keyframes roate {
            from {
                transform: rotate(0deg);
                width: 100px;
                height: 100px;
            }
            to {
                transform: rotate(360deg);
                width: 200px;
                height: 200px;
            }
        }

        .xs {
            width: 50px;
            float: left;
            height: 30px;
            font-weight:bold;">#F90;
            position: fixed;
            left: 700px;
            top: 0px;
        }
    </style>
</head>

<body>
<script type="text/javascript">
    /*var a,b,c;
     a=$("#dh").offset().top;//元素相对于窗口的距离
     b=$(window).scrollTop(); //监控窗口已滚动的距离;
     c=$(document).height();//整个文档的高度
     d=$(window).height();//浏览器窗口的高度
     element  标签
     cssname  动画
     offset  相对于窗口的距离
     */
    function scrollnumber(element, cssname, offset) {
        var a, b, c, d;
        d = $(element).offset().top;
        a = eval(d + offset);
        b = $(window).scrollTop();
        c = $(window).height();
        if (b + c > a) {
            $((element)).addClass((cssname));
        }
    }

    function scrollfun() {
        scrollnumber("#dh1", 'xz', 100);
        scrollnumber("#dh2", 'xz', 100);
        scrollnumber("#dh3", 'xz', 100);
        scrollnumber("#dh4", 'xz', 100);
    }

    $(document).ready(function (e) {
        scrollfun();
        $(window).scroll(function () {
            scrollfun();
        });
    });
</script>
<div style="height: 1000px;width: 100%"></div>
<div style="height: 1000px;width: 100%">
    <div style="height:auto; font-weight:bold;">#999; width:auto; margin: 0 auto;">
        <div class="com" style="height: auto;font-weight:bold;">darkgray;position: relative;">
            <div id="dh1" class="gs">触发动画111</div>
            <div id="dh2" class="gs">触发动画222</div>
            <div id="dh3" class="gs">触发动画333</div>
            <div id="dh4" class="gs">触发动画444</div>
        </div>

    </div>
</div>
</body>
</html>

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