JavaScript实现鼠标悬停显示图片预览功能

JavaScript实现鼠标悬停显示图片预览功能

一、JavaScript代码

//***********默认设置定义.*********************
tPopWait=50;//停留tWait毫秒后显示提示。
tPopShow=5000;//显示tShow毫秒后关闭提示
showPopStep=20;
popOpacity=99;
//***************内部变量定义*****************
sPop=null;
curShow=null;
tFadeOut=null;
tFadeIn=null;
tFadeWaiting=null;
document.write("<mce:style type='text/css'id='defaultPopStyle'><!--
");  
document.write(".cPopText { line-break : normal;word-break : break-all ; background-color: #FEFCF3;color:#000000; border: 1px #E7B68C solid;padding-top: 2px; padding-right: 4px; padding-left: 4px; padding-bottom: 2px;font-size: 12px;width:96px; filter: Alpha(Opacity=0)}");
document.write("
--></mce:style><style type='text/css'id='defaultPopStyle' mce_bogus="1">");
document.write(".cPopText { line-break : normal;word-break : break-all ; background-color: #FEFCF3;color:#000000; border: 1px #E7B68C solid;padding-top: 2px; padding-right: 4px; padding-left: 4px; padding-bottom: 2px;font-size: 12px;width:96px; filter: Alpha(Opacity=0)}");
document.write("</style>");
document.write("<div id='dypopLayer' style="position:absolute;z-index:1000;" mce_style="position:absolute;z-index:1000;" class='cPopText'></div>");
  
function showPopupText(){
var o=event.srcElement;
MouseX=event.x;
MouseY=event.y;
if(o.alt!=null && o.alt!=""){o.dypop=o.alt;o.alt=""};
if(o.title!=null && o.title!=""){o.dypop=o.title;o.title=""};
if(o.dypop!=sPop) {
sPop=o.dypop;
clearTimeout(curShow);
clearTimeout(tFadeOut);
clearTimeout(tFadeIn);
clearTimeout(tFadeWaiting);
if(sPop==null || sPop=="") {
dypopLayer.innerHTML="";
dypopLayer.style.filter="Alpha()";
dypopLayer.filters.Alpha.opacity=0;
                }  
else {
if(o.dyclass!=null) popStyle=o.dyclass
else popStyle="cPopText";
curShow=setTimeout("showIt()",tPopWait);
            }  
    }  
}  
function showIt(){
dypopLayer.className=popStyle;
dypopLayer.innerHTML=sPop;
popWidth=dypopLayer.clientWidth;
popHeight=dypopLayer.clientHeight;
if(MouseX+12+popWidth>document.body.clientWidth) popLeftAdjust=-popWidth-24
else popLeftAdjust=0;
if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24
else popTopAdjust=0;
dypopLayer.style.left=MouseX+12+document.body.scrollLeft+popLeftAdjust;
dypopLayer.style.top=MouseY+12+document.body.scrollTop+popTopAdjust;
dypopLayer.style.filter="Alpha(Opacity=0)";
fadeOut();
}  
function fadeOut(){
if(dypopLayer.filters.Alpha.opacity<popOpacity) {
dypopLayer.filters.Alpha.opacity+=showPopStep;
tFadeOut=setTimeout("fadeOut()",1);
        }  
else {
dypopLayer.filters.Alpha.opacity=popOpacity;
tFadeWaiting=setTimeout("fadeIn()",tPopShow);
            }  
}  
function fadeIn(){
if(dypopLayer.filters.Alpha.opacity>0) {
dypopLayer.filters.Alpha.opacity-=1;
tFadeIn=setTimeout("fadeIn()",1);
        }  
}  
document.onmouseover=showPopupText;

二、HTML代码包含JavaScript代码即可，使用范例

<a href="../UpLoadFile/200911784060017.jpg" target="_blank" title="<img src=../UpLoadFile/200911784060017.jpg />">大</a>&nbsp;<a href="../UpLoadFile/200911784060018.jpg" target="_blank" title="<img src=../UpLoadFile/200911784060018.jpg width=96 height=70 />">小</a>