用法:
$("button").click(function(){$("p").fadeOut();});
fadeOut() 方法逐渐改变被选元素的不透明度,从可见到隐藏(褪色效果)。
注释:隐藏的元素不会被完全显示(不再影响页面的布局)。
提示:该方法通常与 fadeIn() 方法一起使用。
$(selector).fadeOut(speed,easing,callback)
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)。
先来看看设置透明度的兼容性代码:
参数描述speed可选。规定褪色效果的速度。
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)。
先来看看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IEele.style.opacity = opacity / 100;} else {///兼容老版本ieele.style.filter = "alpha(opacity=" + opacity + ")";}}
关于有的小伙伴这样写:
function setOpacity(ele, opacity) {if (document.all) {///兼容ieele.style.filter = "alpha(opacity=" + opacity + ")";}ele {///兼容FF和GGele.style.opacity = opacity / 100;}}
我想说这样在IE10下运行有问题,点了之后没反应。因为IE10支持opacity属性不支持filter了,这个方法不可取。
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);}}, 500);}}
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);}}, 500);}}
下面给一个demo示例:
<!DOCTYPE html><html xmlns="/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>