js_code_move/huadong.html at master · yutaolian/js_code_move · GitHub

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<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>运动框架---滑动框</title>
    <style>
        #div1{
            width: 200px;
            height: 200px;
            background-color: brown;
            position: absolute;
            right: 0px;

        }

    </style>
    <script>
        window.onscroll = function(){

            var oDiv = document.getElementById("div1")

            var scrollTop = document.documentElement.scrollTop||document.body.scrollTop;

          //  oDiv.style.top = scrollTop+(document.documentElement.clientHeight-oDiv.offsetHeight)/2+"px";

            var t = scrollTop+(document.documentElement.clientHeight-oDiv.offsetHeight)/2;
            //不转为整数的会抖动（就是目标点位小数，屏幕的像素没有小数。）
            startMove(parseInt(t));

        }

        var timmer = null;
        function startMove(target){

            var oDiv = document.getElementById("div1");

            clearInterval(timmer);

            timmer = setInterval(function(){

                var speed = (target-oDiv.offsetTop)/8;

                speed = speed>0?Math.ceil(speed):Math.floor(speed);

                if(oDiv.offsetTop == target){

                    clearInterval(timmer);

                }else{

                    oDiv.style.top = oDiv.offsetTop+speed+'px';
                }
            },30)
        }
    </script>
</head>


<body style="height: 3000px">
<div id="div1">你好</div>
</body>
</html>