javascript中級--運動一

時間 2019-11-19

原文原文鏈接

1、簡單實現分享到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: 200px;
            background: #ccc;
            position: absolute;
            left: -100px;
            top: 30%;
        }
        
        #div1 span {
            width: 20px;
            height: 60px;
            line-height: 20px;
            text-align: center;
            left: 100px;
            top: 70px;
            background: yellow;
            position: absolute;
            /*display: block;*/
        }
    </style>
    <script>
        var timer = null;
        // var iSpeed = null;
        window.onload = function() {
            var oDiv = document.getElementById('div1');
            oDiv.onmouseover = function() {
                startMove(0);
            }
            oDiv.onmouseout = function() {
                startMove(-100);
            }

        }

        function startMove(iTarget) {
            var oDiv = document.getElementById('div1');
            var iSpeed = 10;
            if (oDiv.offsetLeft > iTarget) { //設置速度正負
                iSpeed = -iSpeed;
            }
            clearInterval(timer);
            timer = setInterval(function() {
                if (oDiv.offsetLeft == iTarget) {
                    clearInterval(timer);
                } else {
                    oDiv.style.left = oDiv.offsetLeft + iSpeed + 'px';
                }
            }, 30)
        }
    </script>
</head>

<body>
    <div id="div1">
        <span>分享到</span>
    </div>
</body>

</html>

2、勻速運動框架框架

<!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: 500px;
        }
        
        #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 = 0;
                if (oDiv.offsetLeft < iTarget) {
                    iSpeed = 7;
                } else {
                    iSpeed = -7;
                }
                if (Math.abs(oDiv.offsetLeft - iTarget) < 7) { //判斷是否到達終點一次運動的距離都不夠的時候中止
                    clearInterval(timer); //清除定時器
                    oDiv.style.left = iTarget + 'px';
                } 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>

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