javascript中級--運動三

時間 2019-11-19

原文原文鏈接

1、緩衝運動html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        #div1 {
            width: 100px;
            height: 100px;
            background: red;
            position: absolute;
            left: 0px;
        }
        
        #div2 {
            width: 1px;
            height: 300px;
            background: black;
            position: absolute;
            left: 300px;
        }
    </style>
    <script>
        window.onload = function() {

        }
        var timer = null;

        function starMove(iTarget) {
            var oDiv = document.getElementById('div1');
            clearInterval(timer); //防止定時器累加
            timer = setInterval(function() {
                var iSpeed = (iTarget - oDiv.offsetLeft) / 8;
                //Math.ceil向上取整
                //Math.floor向下取整
                // if (iSpeed > 0) {
                //     iSpeed = Math.ceil(iSpeed);
                // } else {
                //     iSpeed = Math.floor(iSpeed);
                // }
                iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
                if (oDiv.offsetLeft == iTarget) { //判斷是否到達終點
                    clearInterval(timer); //清除定時器
                } else {
                    oDiv.style.left = oDiv.offsetLeft + iSpeed + 'px';
                }
            }, 30);
        }
    </script>
</head>

<body>
    <input type="button" name="" value="運動" onclick="starMove(300)">
    <div id="div1"></div>
    <div id="div2"></div>
</body>

</html>

2、滑動的側邊欄ui

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        #div1 {
            width: 100px;
            height: 100px;
            background: red;
            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;
            startMove(parseInt(t));
        }

        var timer = null;

        function startMove(iTarget) {
            var oDiv = document.getElementById('div1');
            clearInterval(timer);
            timer = setInterval(function() {
                var iSpeed = (iTarget - oDiv.offsetTop) / 8;
                iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
                if (oDiv.offsetTop == iTarget) {
                    clearInterval(timer);
                } else {
                    oDiv.style.top = oDiv.offsetTop + iSpeed + 'px';
                }
            }, 30);
        }
    </script>
</head>

<body style="height:1000000px;">
    <div id="div1"></div>
</body>

</html>

相關標籤/搜索

每日一句

每一个你不满意的现在，都有一个你没有努力的曾经。