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<html>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JS网页图片查看器－可控制图片放大缩小还原移动效果</title>
<META HTTP-EQUIV="imagetoolbar" CONTENT="no">
<style type="text/css">
body { font-family: "Verdana", "Arial", "Helvetica", "sans-serif"; font-size: 12px; line-height: 180%; }
td { font-size: 12px; line-height: 150%; }
</style>
<SCRIPT language=JavaScript>
drag = 0
move = 0
// 拖拽对象
// 参见：http://blog.sina.com.cn/u/4702ecbe010007pe
var ie=document.all;
var nn6=document.getElementById&&!document.all;
var isdrag=false;
var y,x;
var oDragObj;
function moveMouse(e) {
if (isdrag) {
oDragObj.style.top = (nn6 ? nTY + e.clientY - y : nTY + event.clientY - y)+"px";
oDragObj.style.left = (nn6 ? nTX + e.clientX - x : nTX + event.clientX - x)+"px";
return false;
}
}
function initDrag(e) {
var oDragHandle = nn6 ? e.target : event.srcElement;
var topElement = "HTML";
while (oDragHandle.tagName != topElement && oDragHandle.className != "dragAble") {
oDragHandle = nn6 ? oDragHandle.parentNode : oDragHandle.parentElement;
}
if (oDragHandle.className=="dragAble") {
isdrag = true;
oDragObj = oDragHandle;
nTY = parseInt(oDragObj.style.top+0);
y = nn6 ? e.clientY : event.clientY;
nTX = parseInt(oDragObj.style.left+0);
x = nn6 ? e.clientX : event.clientX;
document.onmousemove=moveMouse;
return false;
}
}
document.onmousedown=initDrag;
document.onmouseup=new Function("isdrag=false");
function clickMove(s){
if(s=="up"){
dragObj.style.top = parseInt(dragObj.style.top) + 100;
}else if(s=="down"){
dragObj.style.top = parseInt(dragObj.style.top) - 100;
}else if(s=="left"){
dragObj.style.left = parseInt(dragObj.style.left) + 100;
}else if(s=="right"){
dragObj.style.left = parseInt(dragObj.style.left) - 100;
}
}
function smallit(){
var height1=images1.height;
var width1=images1.width;
images1.height=height1/1.2;
images1.width=width1/1.2;
}
function bigit(){
var height1=images1.height;
var width1=images1.width;
images1.height=height1*1.2;
images1.width=width1*1.2;
}
function realsize()
{
images1.height=images2.height;
images1.width=images2.width;
block1.style.left = 0;
block1.style.top = 0;
}
function featsize()
{
var width1=images2.width;
var height1=images2.height;
var width2=360;
var height2=200;
var h=height1/height2;
var w=width1/width2;
if(height1<height2&&width1<width2)
{
images1.height=height1;
images1.width=width1;
}
else
{
if(h>w)
{
images1.height=height2;
images1.width=width1*height2/height1;
}
else
{
images1.width=width2;
images1.height=height1*width2/width1;
}
}
block1.style.left = 0;
block1.style.top = 0;
}
</SCRIPT>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_reloadPage(init) { //reloads the window if Nav4 resized
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->
</script>
<style type="text/css">
<!--
td, a { font-size:12px; color:#000000 }
#Layer1 { position:absolute; z-index:100; top: 10px; }
#Layer2 { position:absolute; z-index:1; }
-->
</style>
</head>
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" oncontextmenu="return false" ondragstart="return false" onselectstart ="return false" onselect="document.selection.empty()" oncopy="document.selection.empty()" onbeforecopy="return false" onmouseup="document.selection.empty()" style="overflow-y:hidden;overflow-x:hidden;">
<div id="Layer1">
<table border="0" cellspacing="2" cellpadding="0">
<tr>
<td> </td>
<td><img src="http://img.jb51.net/images/map/up.gif" width="20" height="20" style="cursor:hand" onClick="clickMove(‘up‘)" title="向上"></td>
<td> </td>
</tr>
<tr>
<td><img src="http://img.jb51.net/images/map/left.gif" width="20" height="20" style="cursor:hand" onClick="clickMove(‘left‘)" title="向左"></td>
<td><img src="http://img.jb51.net/images/map/zoom.gif" width="20" height="20" style="cursor:hand" onClick="realsize();" title="还原"></td>
<td><img src="http://img.jb51.net/images/map/right.gif" width="20" height="20" style="cursor:hand" onClick="clickMove(‘right‘)" title="向右"></td>
</tr>
<tr>
<td> </td>
<td><img src="http://img.jb51.net/images/map/down.gif" width="20" height="20" style="cursor:hand" onClick="clickMove(‘down‘)" title="向下"></td>
<td> </td>
</tr>
<tr>
<td> </td>
<td><img src="http://img.jb51.net/images/map/zoom_in.gif" width="20" height="20" style="cursor:hand" onClick="bigit();" title="放大"></td>
<td> </td>
</tr>
<tr>
<td> </td>
<td><img src="http://img.jb51.net/images/map/zoom_out.gif" width="20" height="20" style="cursor:hand" onClick="smallit();" title="缩小"></td>
<td> </td>
</tr>
</table>
</div>
<p>
<div id=‘hiddenPic‘ style=‘position:absolute; left:0px; top:0px; width:0px; height:0px; z-index:1; visibility: hidden;‘><img name=‘images2‘ src=‘http://img.jb51.net/images/map/760-480bsx.jpg‘ border=‘0‘></div>
<div id=‘block1‘ onmouseout=‘drag=0‘ onmouseover=‘dragObj=block1; drag=1;‘ style=‘z-index:10; height: 0; left: 0px; position: absolute; top: 0px; width: 0‘ class="dragAble"> <img name=‘images1‘ src=‘http://img.jb51.net/images/map/760-480bsx.jpg‘ border=‘0‘></div>
</body>
</html>
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原文地址：http://www.cnblogs.com/fgwh/p/4457353.html
