这是一篇很有收藏价值的文章《javascript实现的图片预览功能》，在开发过程对大家很有帮助，小编结合实例代码给大家介绍的非常详细，需要的朋友可以参考下
本文实例讲述了javascript实现的图片预览功能。分享给大家供大家参考，具体如下：
1.将下面的代码复制到<head>内
<script>
/*
Thumbnail image viewer-
?Dynamic Drive (www.dynamicdrive.com)
For full source code, usage terms, and 100's more DHTML scripts, visit http://dynamicdrive.com
*/
function enlarge(which,e){
//Render image code for IE 4+
if (document.all){
if (showimage.style.visibility=="hidden"){
showimage.style.left=document.body.scrollLeft+event.clientX
showimage.style.top=document.body.scrollTop+event.clientY
showimage.innerHTML='<img src="'+which+'">'
showimage.style.visibility="visible"
}
else
showimage.style.visibility="hidden"
return false
}
//Render image code for NS 4
else if (document.layers){
if (document.showimage.visibility=="hide"){
document.showimage.document.write('<a rel="nofollow noopener noreferrer" href="#" rel="external nofollow" onMouseover="drag_dropns(showimage)"><img src="'+which+'" border=0></a>')
document.showimage.document.close()
document.showimage.left=e.x
document.showimage.top=e.y
document.showimage.visibility="show"
}
else
document.showimage.visibility="hide"
return false
}
//if NOT IE 4+ or NS 4, simply display image in full browser window
else
return true
}
</script>
<script language="JavaScript1.2">
//By Dynamicdrive.com
//drag drop function for NS 4////
/////////////////////////////////
var nsx
var nsy
var nstemp
function drag_dropns(name){
temp=eval(name)
temp.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP)
temp.onmousedown=gons
temp.onmousemove=dragns
temp.onmouseup=stopns
}
function gons(e){
temp.captureEvents(Event.MOUSEMOVE)
nsx=e.x
nsy=e.y
}
function dragns(e){
temp.moveBy(e.x-nsx,e.y-nsy)
return false
}
function stopns(){
temp.releaseEvents(Event.MOUSEMOVE)
}
//drag drop function for IE 4+////
/////////////////////////////////
var dragapproved=false
function drag_dropie(){
if (dragapproved==true){
document.all.showimage.style.pixelLeft=tempx+event.clientX-iex
document.all.showimage.style.pixelTop=tempy+event.clientY-iey
return false
}
}
function initializedragie(){
if (event.srcElement.parentElement.id=="showimage"){
iex=event.clientX
iey=event.clientY
tempx=showimage.style.pixelLeft
tempy=showimage.style.pixelTop
dragapproved=true
document.onmousemove=drag_dropie
}
}
if (document.all){
document.onmousedown=initializedragie
document.onmouseup=new Function("dragapproved=false")
}
</script>
2.在<body>中加入
<div id="showimage" style="position:absolute;visibility:hidden"></div>
3.在连接图片的地方这样写
<a rel="nofollow noopener noreferrer" href="photo1.jpg" rel="external nofollow" onClick="return enlarge('photo1.jpg',event)"><img src="thumbnail.gif" border="0"></a>
记得更改图片路径
希望本文所述对大家JavaScript程序设计有所帮助。
以上就是javascript实现的图片预览功能。心态是横在人生路上的双向门，大家能够把它转向一边进入成功，也可以把它转到另一边，进入失败。更多关于javascript实现的图片预览功能请关注haodaima.com其它相关文章！