原生js实现fadein 和 fadeout

来源：互联网发布：ff14萨菲罗斯捏脸数据编辑：程序博客网时间：2024/05/17 03:10

js里面设置DOM节点透明度的函数属性：filter= "alpha(opacity=" + value+ ")"（兼容ie）和opacity=value/100（兼容FF和GG）。

设置透明度的兼容性代码：

function setOpacity(ele, opacity) {    if (ele.style.opacity != undefined) {        ///兼容FF和GG和新版本IE        ele.style.opacity = opacity / 100;    } else {        ///兼容老版本ie        ele.style.filter = "alpha(opacity=" + opacity + ")";    }}

fadein 函数代码：

function fadein(ele, opacity, speed) {    if (ele) {        var v = ele.style.filter.replace("alpha(opacity=", "").replace(")", "") || ele.style.opacity;        v < 1 && (v = v * 100);        var count = speed / 1000;        var avg = count < 2 ? (opacity / count) : (opacity / count - 1);        var timer = null;        timer = setInterval(function() {            if (v < opacity) {                v += avg;                setOpacity(ele, v);            } else {                clearInterval(timer);            }        }, 100);    }}

fadeout 函数代码：

function fadeout(ele, opacity, speed) {    if (ele) {        var v = ele.style.filter.replace("alpha(opacity=", "").replace(")", "") || ele.style.opacity || 100;        v < 1 && (v = v * 100);        var count = speed / 1000;        var avg = (100 - opacity) / count;        var timer = null;        timer = setInterval(function() {            if (v - avg >= opacity) {                v -= avg;                setOpacity(ele, v);            } else {                clearInterval(timer);            }        }, 100);    }}

demo示例：

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title></title><script type="text/javascript" src="fade.js"></script>    <script type="text/javascript">                 window.onload = function () {            document.getElementById('Button1').onclick = function () {                fadeout(document.getElementById('DV'), 0, 6000);            }            document.getElementById('Button2').onclick = function () {                fadein(document.getElementById('DV'), 80, 6000);            }        }    </script></head><body>    <div id="DV" style="background-color: green; width: 400px; height: 400px;"></div>    <input id="Button1" type="button" value="button" />    <input id="Button2" type="button" value="button" /></body></html>

转自：http://www.cnblogs.com/a546558309/p/3737070.html

阅读全文

0 0