js鼠标滑到图片上显示渐变弹出大图

js鼠标滑到图片上显示渐变弹出大图

dome示例：

js代码如下：

[codesyntax lang="php"]

function getViewportHeight() {
if (window.innerHeight!=window.undefined) return window.innerHeight;
if (document.compatMode=='CSS1Compat') return document.documentElement.clientHeight;
if (document.body) return document.body.clientHeight;

return window.undefined;
}
function getViewportWidth() {
if (window.innerWidth!=window.undefined) return window.innerWidth;
if (document.compatMode=='CSS1Compat') return document.documentElement.clientWidth;
if (document.body) return document.body.clientWidth;

return window.undefined;
}

/**
* Gets the real scroll top
*/
function getScrollTop() {
if (self.pageYOffset) // all except Explorer
{
return self.pageYOffset;
}
else if (document.documentElement && document.documentElement.scrollTop)
// Explorer 6 Strict
{
return document.documentElement.scrollTop;
}
else if (document.body) // all other Explorers
{
return document.body.scrollTop;
}
}
function getScrollLeft() {
if (self.pageXOffset) // all except Explorer
{
return self.pageXOffset;
}
else if (document.documentElement && document.documentElement.scrollLeft)
// Explorer 6 Strict
{
return document.documentElement.scrollLeft;
}
else if (document.body) // all other Explorers
{
return document.body.scrollLeft;
}
}
/*
渐变的弹出图片
使用方法：
将ToolTip.js包含在网页body的结束标签后
调用方法：

<a href="http://www.webzsky.com/source/web_img/dwcs6_01.jpg" target='_blank' onMouseOver="toolTip('<img src=http://www.webzsky.com/source/web_img/dwcs6_02.jpg>')" onMouseOut="toolTip()"><img src='http://www.webzsky.com/source/web_img/dwcs6_01.jpg' border=0 1 title="点击看大图"></a>

必须CSS样式
.trans_msg
{
filter:alpha(opacity=100,enabled=1) revealTrans(duration=.2,transition=1) blendtrans(duration=.2);
}
*/
//--初始化变量--
var rT=true;//允许图像过渡
var bT=true;//允许图像淡入淡出
var tw=150;//提示框宽度
var endaction=false;//结束动画
var ns4 = document.layers;
var ns6 = document.getElementById && !document.all;
var ie4 = document.all;
offsetX = 10;
offsetY = 20;
var toolTipSTYLE="";
function initToolTips()
{
tempDiv = document.createElement("div");
tempDiv.id = "toolTipLayer";
tempDiv.style.position = "absolute";
tempDiv.style.display = "none";
document.body.appendChild(tempDiv);
if(ns4||ns6||ie4)
{
if(ns4) toolTipSTYLE = document.toolTipLayer;
else if(ns6) toolTipSTYLE = document.getElementById("toolTipLayer").style;
else if(ie4) toolTipSTYLE = document.all.toolTipLayer.style;
if(ns4) document.captureEvents(Event.MOUSEMOVE);
else
{
toolTipSTYLE.visibility = "visible";
toolTipSTYLE.display = "none";
}
document.onmousemove = moveToMouseLoc;
}
}
function toolTip(msg, fg, bg)
{
try {
if(toolTip.arguments.length < 1) // hide
{
if(ns4)
{
toolTipSTYLE.visibility = "hidden";
}
else
{
//--图象过渡，淡出处理--
if (!endaction) {toolTipSTYLE.display = "none";}
if (rT) document.all("msg1").filters[1].Apply();
if (bT) document.all("msg1").filters[2].Apply();
document.all("msg1").filters[0].opacity=0;
if (rT) document.all("msg1").filters[1].Play();
if (bT) document.all("msg1").filters[2].Play();
if (rT){
if (document.all("msg1").filters[1].status==1 || document.all("msg1").filters[1].status==0){
toolTipSTYLE.display = "none";}
}
if (bT){
if (document.all("msg1").filters[2].status==1 || document.all("msg1").filters[2].status==0){
toolTipSTYLE.display = "none";}
}
if (!rT && !bT) toolTipSTYLE.display = "none";
//----------------------
}
}
else // show
{
if(!fg) fg = "#777777";
if(!bg) bg = "#eeeeee";
var content =
'

' +
'

' + msg +
'

';

if(ns4)
{
toolTipSTYLE.document.write(content);
toolTipSTYLE.document.close();
toolTipSTYLE.visibility = "visible";
}
if(ns6)
{
document.getElementById("toolTipLayer").innerHTML = content;
toolTipSTYLE.display='block'
}
if(ie4)
{
document.all("toolTipLayer").innerHTML=content;
toolTipSTYLE.display='block'
//--图象过渡，淡入处理--
var cssopaction=document.all("msg1").filters[0].opacity
document.all("msg1").filters[0].opacity=0;
if (rT) document.all("msg1").filters[1].Apply();
if (bT) document.all("msg1").filters[2].Apply();
document.all("msg1").filters[0].opacity=cssopaction;
if (rT) document.all("msg1").filters[1].Play();
if (bT) document.all("msg1").filters[2].Play();
//----------------------
}
}
} catch(e) {}
}
function moveToMouseLoc(e)
{
var scrollTop = getScrollTop();
var scrollLeft = getScrollLeft();
if(ns4||ns6)
{
x = e.pageX + scrollLeft;
y = e.pageY - scrollTop;
}
else
{
x = event.clientX + scrollLeft;
y = event.clientY;
}

if (x-scrollLeft > getViewportWidth() / 2) {
x = x - document.getElementById("toolTipLayer").offsetWidth - 2 * offsetX;
}

if ((y+document.getElementById("toolTipLayer").offsetHeight+offsetY)>getViewportHeight()) {
y = getViewportHeight()-document.getElementById("toolTipLayer").offsetHeight-offsetY;
}
toolTipSTYLE.left = (x + offsetX)+'px';
toolTipSTYLE.top = (y + offsetY + scrollTop)+'px';
return true;
}
initToolTips();

[/codesyntax]

html代码如下：

<a onmouseover="toolTip('&lt;img src=http://www.webzsky.com/source/web_img/dwcs6_02.jpg&gt;')" onmouseout="toolTip()" href="http://www.webzsky.com/source/web_img/dwcs6_02.jpg" target="_blank"><img title="点击看大图" alt="" src="http://www.webzsky.com/source/web_img/dwcs6_01.jpg" width="240" height="260" align="absmiddle" border="0" /></a>

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