解决IE7以下版本不支持无A状态伪类的几种方法
在IE7以下版本一直是不支持无A状态伪类的，通常都要靠Javascript来解决的，最近经常有人问起此类问题，故整理了几种方法，脚本来自国外网站，供大家参考。
方法一
javascript文件，来自Htmldog
function suckerfish(type, tag, parentId) {
if (window.attachEvent) {
window.attachEvent("onload", function() {
var sfEls = (parentId==null)?document.getElementsByTagName(tag):document.getElementById(parentId).getElementsByTagName(tag);
type(sfEls);
});
}
}
sfHover = function(sfEls) {
for (var i=0; i < sfEls.length; i++) {
sfEls[i].onmouseover=function() {
this.className+=" sfhover";
}
sfEls[i].onmouseout=function() {
this.className=this.className.replace(new RegExp(" sfhover//b"), "");
}
}
}
sfFocus = function(sfEls) {
for (var i=0; i < sfEls.length; i++) {
sfEls[i].onfocus=function() {
this.className+=" sffocus";
}
sfEls[i].onblur=function() {
this.className=this.className.replace(new RegExp(" sffocus//b"), "");
}
}
}
suckerfish(sfHover, "INPUT");
suckerfish(sfFocus, "INPUT");
suckerfish(sfHover, "p");
function suckerfish(type, tag, parentId) {
if (window.attachEvent) {
window.attachEvent("onload", function() {
var sfEls = (parentId==null)?document.getElementsByTagName(tag):document.getElementById(parentId).getElementsByTagName(tag);
type(sfEls);
});
}
}
sfHover = function(sfEls) {
for (var i=0; i < sfEls.length; i++) {
sfEls[i].onmouseover=function() {
this.className+=" sfhover";
}
sfEls[i].onmouseout=function() {
this.className=this.className.replace(new RegExp(" sfhover//b"), "");
}
}
}
sfFocus = function(sfEls) {
for (var i=0; i < sfEls.length; i++) {
sfEls[i].onfocus=function() {
this.className+=" sffocus";
}
sfEls[i].onblur=function() {
this.className=this.className.replace(new RegExp(" sffocus//b"), "");
}
}
}
suckerfish(sfHover, "INPUT");
suckerfish(sfFocus, "INPUT");
suckerfish(sfHover, "p");
脚本可改动的部分
//这里写入你需要效果的标签
suckerfish(sfHover, "INPUT");
suckerfish(sfFocus, "INPUT");
suckerfish(sfHover, "p");
//这里写入你需要效果的标签
suckerfish(sfHover, "INPUT");
suckerfish(sfFocus, "INPUT");
suckerfish(sfHover, "p");
CSS
input:focus,input.sffocus {
background: #F8F8F8;
color: #333333;
border: 1px solid red;
}
input:hover,input.sfhover{
background: #EEE;
color: #369;
border: 1px solid #069;
}
p:hover,p.sfhover{
background: #EEE;
color: #333;
border: 1px solid #069;
}
p:hover,p.sfhover{
background: #EEE;
color: #333;
}
input:focus,input.sffocus {
background: #F8F8F8;
color: #333333;
border: 1px solid red;
}
input:hover,input.sfhover{
background: #EEE;
color: #369;
border: 1px solid #069;
}
p:hover,p.sfhover{
background: #EEE;
color: #333;
border: 1px solid #069;
}
p:hover,p.sfhover{
background: #EEE;
color: #333;
}
上面代码中第一个类是给支持CSS2的浏览器，第二个是给IE6及以下版本的。需注意的是，你给某标签设定了，那么整个页面内的这个标签都会沿用同一个样式。
方法二
javascript文件
var W3CDOM = (document.createElement && document.getElementsByTagName);
//window.onload = pinballEffect;
function pinballEffect()
{
if (!W3CDOM) return;
var allElements = document.getElementsByTagName('*');
var originalBackgrounds=new Array();
for (var i=0; i < allElements.length; i++)
{
if (allElements[i].className.indexOf('hovereffect') !=-1)
{
allElements[i].onmouseover = mouseGoesOver;
allElements[i].onmouseout = mouseGoesOut;
}
}
}
function mouseGoesOver()
{
originalClassNameString = this.className;
this.className += " lay-on";
}
function mouseGoesOut()
{
this.className = originalClassNameString;
}
pinballEffect();
var W3CDOM = (document.createElement && document.getElementsByTagName);
//window.onload = pinballEffect;
function pinballEffect()
{
if (!W3CDOM) return;
var allElements = document.getElementsByTagName('*');
var originalBackgrounds=new Array();
for (var i=0; i < allElements.length; i++)
{
if (allElements[i].className.indexOf('hovereffect') !=-1)
{
allElements[i].onmouseover = mouseGoesOver;
allElements[i].onmouseout = mouseGoesOut;
}
}
}
function mouseGoesOver()
{
originalClassNameString = this.className;
this.className += " lay-on";
}
function mouseGoesOut()
{
this.className = originalClassNameString;
}
pinballEffect();
脚本可改动的部分
if (allElements[i].className.indexOf('hovereffect') !=-1)
if (allElements[i].className.indexOf('hovereffect') !=-1)
CSS
.hovereffect{
Background: #CCC;
}
.hovereffect{
Background: #CCC;
}
在需要应用效果的地方用class="hovereffect"调用。这种方法比较灵活。
方法三
使用网上常见的onmouseover、onmouseout这类东西，行为和结构不分离，不推荐使用。