如何利用控制图片的大小

try
--------------------------------
<script language="javascript">
var maxWidth=200;//最大宽度
var maxHeight=200;//最大高度function getSize(img){
var r = {
width: img.width,
height: img.height
};
if(r.width>maxWidth){
r.width=maxWidth;
r.height=img.height*maxWidth/img.width;
}if(r.height>maxHeight){
r.height=maxHeight;
r.width=img.width*maxHeight/img.height;
}
return r;
}
function ReImgSize(){
for (j=0;j<document.images.length;j++)
{
var r = getSize(document.images[j]);
document.images[j].width=r.width;
document.images[j].height=r.height;
}
}document.body.onload=ReImgSize;</script>

解决方案 »

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title></head><body>
<script language="javascript">
var maxWidth=100;//最大宽度
var maxHeight=100;//最大高度function getSize(img){
var r = {
width: img.width,
height: img.height
};
if(r.width>maxWidth){
r.width=maxWidth;
r.height=img.height*maxWidth/img.width;
}if(r.height>maxHeight){
r.height=maxHeight;
r.width=img.width*maxHeight/img.height;
}
return r;
}
function ReImgSize(){
for (j=0;j<document.images.length;j++)
{
var r = getSize(document.images[j]);
document.images[j].width=r.width;
document.images[j].height=r.height;
}
}document.body.onload=ReImgSize;</script>
<img src="http://community.csdn.net//images/csdn.gif" border="0" width="550" height="550">
</body>
</html>
用纯Script的方法无法解决。因为onload这后再 resize的。
<!doctype html public "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312">
<head>
<title> New Document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<link rel="stylesheet" rev="stylesheet" href="css/style.css" type="text/css" media="all" />
<style type="text/css">
body { background : white ; color : black ; }
</style>
<link rel="icon" href="/favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
<script language="JavaScript">

</script>
</head><body onload="ReImgSize();">
<div><IMG SRC="http://image2.sina.com.cn/dy/c/2006-09-07/1b4c1c56659d7b9cfb409cfba84dbc9f.jpg" border=0 alt=按此在新窗口浏览图片></div>
<div id="test" style="display:none;">
<IMG SRC="http://image2.sina.com.cn/dy/c/2006-09-07/1b4c1c56659d7b9cfb409cfba84dbc9f.jpg" border=0 alt=按此在新窗口浏览图片>
</div>
<input type=button value="显示隐藏的图片" onclick="javascript:document.getElementById('test').style.display='block';">
</body>
</html>我隐藏了图片，当打开的时候就行了，无法控制这些图片，根本显示不出来,可以拷贝上面代码看看，普通图片是可以的。对于隐藏就行了
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> Document </TITLE>
<style type="text/css">
body{
padding : 0px ;
margin : 0px;
background-color : #999999 ;}
.DivMain {
position : absolute ;
text-align : center ;
overflow : hidden ;
}
.DivMenu {
position : absolute ;
text-align : left ;
overflow : hidden ;
}
.ImgMain {
position : absolute ;
overflow : hidden ;
border : 0px ;
}
.TBMain {
background-color : #CCCCCC ;
padding : 0px ;
border : 0px ;
z-index : 99 ;
line-height : 18px ;

}
.TBMenu {
background-color : #FFCCCC ;
padding : 0px ;
border : 0px ;
z-index : 99 ;
color: #000000 ;

}
.HrScroll {
margin : 0px;
background-color : #FFFFFF ;
padding : 0px ;
border : 0px ;
z-index : 99 ;
color : #000000 ;
border-spacing : 0px;
width : 160px ;
height : 10px ;
}
</style><SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</HEAD><BODY oncontextmenu="fnContextMenu()">
<form name="fmImgZoom">
<TABLE id="tbMain" class="TBMain">
<TR>
<TD>
<input type="button" name="ZoomIn" value="ZoomIn" onclick="fnZoomIn()" disabled>
<input type="button" name="ZoomOut" value="ZoomOut" onclick="fnZoomOut()" disabled>
<input type="button" name="Original" value="Original" onclick="setOriginal()" disabled>
<input type="button" name="FitScreen" value="FitScreen" onclick="setFitScreen()" disabled>
<input type="button" name="btnView" value="hide/view" onclick="setDisplay()" disabled>
<input id="btnImgInfo" size="50" disabled>
</TD>
</TR>
</TABLE>
<div id="divMain" class="DivMain" onmousedown="fnDivMouseDown()">
<img src="22.jpg" id="imgMain" class="imgMain" onload="setInit(this)" onmousedown="fnMouseDown(this)" onmousemove="fnMouseMove()" onmouseup="fnMouseUp()" ></div>
<div id="divMenu" class="DivMenu" style="visibility:hidden"" onmousedown="fnMouseDown(this)" onmousemove="fnMouseMove()" onmouseup="fnMouseUp()" >
<TABLE class="TBMenu">
<TR>
<TD>10%</TD>
<TD><button id="HrScroll" class="HrScroll"><hr noshade></button> </TD>
<TD>1600%</TD>
</TR>
</TABLE>
</div>
<DIV ID="DivFlag" STYLE="position:absolute;visibility:hidden;width:1px;height:10px;z-index:99"  onmousedown="fnSlipMouseDown(this)" onmousemove="fnSlipMouseMove()" onmouseup="fnSlipMouseUp()" onmouseover="this.style.cursor ='hand'" onmouseout="this.style.cursor=''">↑</DIV>
</form>
</BODY>
</HTML>
世界真复杂！
<body onload="checkImg();return true;">
<TABLE width="60%" border="1" id="utable">
<TR>
<TD><IMG SRC="http://images.sohu.com/uiue/sohu_logo/beijing2008/sohu.gif" BORDER="1" ALT=""></TD>
<TD><IMG SRC="http://photo.pic.sohu.com/images/webimages/pic_logo.gif" BORDER="1" ALT="fasdddddddddd"></TD>
</TR>
<TR>
<TD><IMG SRC="http://photo.pic.sohu.com/images/travel/2006-08-07/10df245f574.jpg" BORDER="1" ALT="dasdddddd"></TD>
<TD><IMG SRC="http://photo.pic.sohu.com/images/women/2006-09-05/10e889036b0.jpg" BORDER="1" ALT="asdffffffffff"></TD>
</TR>
</TABLE>
</body>
</html>
<script>

function checkImg()
{
var imges = document.getElementsByTagName("IMG"); for (var i=00; i<imges.length ; i++)
{
var cwidth = (0+imges[i].width > 30)?30:imges[i].width;
var cheight = (0+imges[i].height > 30)?30:imges[i].height;
imges[i].setAttribute("width", cwidth);
imges[i].setAttribute("height", cheight);
delete cwidth;
}
return true;
}</script>
1 直接设定 width和height??A：上面的例子已经说明了2 <img onload="javascript:if(this.width>500){this.width=500;}";??A：onload="alert(this.getAttribute('width'));" OR onload="alert(this.style.width);";3 function ReImgSize()
{
for (j=0;j<document.images.length;j++)
{
//document.images[j].width=(document.images[j].width>500)?"500":document.images[j].width;
var tmpW = (document.images[j].width>500)?"500":document.images[j].width;
document.images[j].setAttribute("width",tmpW);//OR document.images[j].style.width = tmpW+'px';
delete tmpW;
}
}A：这样只是取到了你设定的高度，并没有去设定，如果超出你的500后的高度；