1，掉鏈級(jí)圖片的替代圖片
<img src="no.jpg" onerror="this.src=‘images/logo.gif‘">
2，自動(dòng)縮小大圖
經(jīng)常看到一些圖片很大，上傳后顯示會(huì)撐滿(mǎn)屏幕下面的例子通過(guò)檢測(cè)if(this.width>screen.width-350)then(this.width=screen.width-350)如果該圖片的寬度大于“屏幕寬度-350”，則讓該圖就顯示“屏幕寬度-350”這么大小。
原圖<br>
<img src="jsimg/wallpaper.jpg"><br>
設(shè)定大小的圖<br>
<img src="jsimg/wallpaper.jpg"
onload="javascript:if(this.width>screen.width-350)this.width=screen.width-350">
3，禁止IE6中大尺寸圖片的自動(dòng)縮小
原圖,會(huì)自動(dòng)縮小<br>
<img src="jsimg/wallpaper.jpg"> <br>
設(shè)定不縮小<br>
<img src="jsimg/wallpaper.jpg" galleryimg="no">
4，去掉用IE6.0瀏覽圖片，當(dāng)鼠標(biāo)放到圖片上時(shí)出現(xiàn)快捷工具（打印、郵寄、另存等）
方法一：
<META HTTP-EQUIV="imagetoolbar" CONTENT="no">
方法二：
<img galleryimg="no">
定義CSS：
<style>
img {nobar:expression(this.galleryImg=‘no‘)}
</style>
5，去掉熱點(diǎn)地圖上的區(qū)域線(xiàn)框與超鏈接的線(xiàn)框
<a href="#" onFocus=this.blur()><img src="jsimg/marylin.jpg"
border=0></a>
6，可控制上傳圖片的大小
<script language="JavaScript">
function orsc()
{
if(img.readyState!="complete")return false;
if(img.offsetWidth!=132&&img.offsetHeight!=99){
alert("您選擇的圖片大?。?+img.offsetWidth+"X"+img.offsetHeight+"\n"+"請(qǐng)選擇132X99大小的圖片")
imgT=true;
}
//alert("圖片大?。?+img.offsetWidth+"X"+img.offsetHeight);
//alert("圖片尺寸："+img.fileSize);
}
function mysubmit(theform)
{
if(theform.file1.value=="")
{
alert("請(qǐng)點(diǎn)擊瀏覽按鈕，選擇您要上傳的JPG或GIF文件!")
theform.file1.focus;
return (false);
}
else
{
str= theform.file1.value;
strs=str.toLowerCase();
lens=strs.length;
extname=strs.substring(lens-4,lens);
if(extname!=".jpg" && extname!=".gif")
{
alert("請(qǐng)選擇JPG或GIF格式的文件!");
return (false);
}else{
document.all("loadImg").src=theform.file1.value
if(document.all("loadImg").offsetWidth!=132&&document.all("loadImg").offsetHeight!=99){
alert("您選擇的圖片大?。?+document.all("loadImg").offsetWidth+"X"+document.all("loadImg").offsetHeight+"\n"+"請(qǐng)選擇132X99大小的圖片")
return (false)
}
}
}
}
</script>
<form onSubmit="return mysubmit(this)" name="form" method="post"
enctype="multipart/form-data">
<table width="100%" border=0 cellspacing=0 cellpadding=0>
<tr><td valign=top height=30>
<input type="hidden" name="act" value="upload">
<input type="file" style="BORDER-TOP-WIDTH: 1px;
BORDER-LEFT-WIDTH: 1px; FONT-SIZE: 12px; BORDER-BOTTOM-WIDTH: 1px;
CURSOR: text; COLOR: #333333; FONT-FAMILY: "MS Shell Dlg",
","Tahoma", ","宋體"; HEIGHT: 20px; BORDER-RIGHT-WIDTH: 1px
" name="file1" value="">
<input type="submit" name="Submit" value="上傳" >
</td>
</tr>
</table>
<img id=loadImg>
</form>
7，檢測(cè)一個(gè)圖片的長(zhǎng)寬尺寸
<script>
var img=null;
function s()
{
if(img)img.removeNode(true);
img=document.createElement("img");
img.style.position="absolute";
img.style.visibility="hidden";
img.attachEvent("onreadystatechange",orsc);
img.attachEvent("onerror",oe);
document.body.insertAdjacentElement("beforeend",img);
img.src=inp.value;
}
function oe()
{
alert("cant load img");
}
function orsc()
{
if(img.readyState!="complete")return false;
alert("高:"+img.offsetHeight+"\n寬:"+img.offsetWidth);
}
</script>
<input type="file" Name="file" id="inp" value="默認(rèn)值"><br><input
onclick="s()" type="button" value="點(diǎn)我一下給出要上傳圖片的大小及長(zhǎng)、寬"
name="button">
8，按比例縮小
<script defer>
for (var i=0;i<document.images.length;i++){
document.images[i].width=document.images[i].width*0.5
}
</script>
<img src="img/wallpaper.jpg">
9，類(lèi)似Acdsee看大圖的時(shí)的拖動(dòng)
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html;
charset=gb2312">
<script language="JavaScript">
<!--
var scrollcount=0;
var dragy;
var scrollarrowtop;
function initdrag() {
scrollcount=1;
dragy=event.clientY;
document.body.setCapture();
}
function startdrag() {
if (scrollcount==1) {
window.scrollBy(dragy-event.clientX,dragy-event.clientY);
document.body.style.cursor=‘hand‘;
dragy=event.clientY;
}
}
function enddrag() {
document.body.style.cursor=‘‘;
scrollcount=0;
document.body.releaseCapture();
}
// -->
</script>
</head>
<body bgcolor="#FFFFFF" text="#000000"
onselectstart="return false;" onmousedown="initdrag()"
onmousemove="startdrag()" onmouseup="enddrag()" scroll=yes>
<img src="img/wallpaper.jpg">
<img src="img/whitney.jpg">
</body>
</html>
10，選擇圖片產(chǎn)生縮略圖，最多10個(gè)
<html>
<head>
<title>Upload Image</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<SCRIPT language=Javascript>
gFlag=false;
var
gMaxSize,gCurrentSize,gUploadSize,gCurInputIndex,gCurImageSrc,gCurOFile;
gMaxSize="10";
gCurrentSize=".18";
gMaxSize=parseFloat(gMaxSize)*1024*1024;
//gMaxSize=parseFloat("1")*1024;
gCurrentSize=parseFloat(gCurrentSize)*1024*1024;
gErr="";
gUploadSize=0;
////////////////////////////////////////////////////
function validate()
{
var lErr;
lErr="";
if((gUploadSize+gCurrentSize)>gMaxSize){
if(form1.TempAlbum.value!=form1.OldAlbum.value){
lErr=".您要上傳的圖片尺寸大于您的剩余相冊(cè)容量,請(qǐng)選擇上傳至\"臨時(shí)相冊(cè)\"\n"+lErr;
}
}
if(form1.OldAlbum.value=="0"){
if(form1.NewAlbum.value.length==0){
lErr=".請(qǐng)輸入新相冊(cè)名稱(chēng)\n"+lErr;
}
}
if(lErr.length>0){
alert("錯(cuò)誤:\n"+lErr);
if(lErr.indexOf("請(qǐng)輸入新相冊(cè)名稱(chēng)\n\n")!=-1){
form1.NewAlbum.focus();
}
return false;
}
form1.submit();
/*進(jìn)度條控制*/
//var
winProgress=window.open("progress.htm","progress","width=300,height=250");
//winProgress.focus();
/*進(jìn)度條控制*/
return true;
}
function handleBadImage() {
alert(‘所選圖片并非有效的JPG格式!\n請(qǐng)重新選擇!‘);
eval("form1.file"+gCurInputIndex+".outerHTML=\"<input
type=\\\"file\\\" name=\\\"file"+gCurInputIndex+"
\\\"
style=\\\"width:275\\\" value=\\\"
\\\"
onChange=\\\"FileChange(this);\\\">\"");
eval("form1.file"+gCurInputIndex+".fireEvent(\"onChange\")");
return false;
}
function handleGoodImage() {
imgsrc=‘<img src="‘+gCurImageSrc+‘"
onload="DrawImage(this,‘+gCurInputIndex+‘); " width="0"
height="0">‘;
gCurOFile.parentNode.previousSibling.innerHTML=imgsrc;
return true;
}
//////////////////////////////////////////
function FileChange(oFile){
gErr="";
gUploadSize=0;
str=‘‘;
gCurOFile=oFile;
gCurImageSrc=oFile.value;
inputname=oFile.name;
i=inputname.substr((inputname.length-1),1);
gCurInputIndex=i;
if (gCurImageSrc.length>0){
//check for none jpg
imgExt=new Image();
imgExt.onload=handleGoodImage;
imgExt.onerror=handleBadImage;
var fileName = gCurImageSrc.replace("\\", "/"); // NN7
var imgURL = ‘file:///‘ + fileName;
if((navigator.appVersion.indexOf(‘Mac‘)>-1) &&
(navigator.appVersion.indexOf(‘MSIE‘)>-1)){
imgURL=‘file://‘ + fileName;
}
imgExt.src=imgURL;
//finish check
}
}
function ShowImgOfServer(NewPath,ImgD){
ImgD.src=NewPath;
}
/////////////////////////////////////
function DrawImage(ImgD,Index){
var flag=false;
var image=new Image();
image.src=ImgD.src;
ImgD.value=ImgD.src;
if(image.fileSize>2048000){
image.outerHTML="";
gErr+="此圖片尺寸過(guò)大,圖片尺寸應(yīng)小于2MB\n";
eval("form1.file"+Index+".outerHTML=\"<input
type=\\\"file\\\" name=\\\"file"+Index+"
\\\" style=\\\"width:275\\\"
value=\\\"
\\\" onChange=\\\"FileChange(this);\\\">\"");
eval("form1.file"+Index+".fireEvent(\"onChange\")");
alert("此圖片尺寸過(guò)大,圖片尺寸應(yīng)小于2MB\n");
return ;
}
if(image.src.substr(image.src.length-3,3).toLowerCase()!="jpg"){
image.outerHTML="";
gErr+="此圖片類(lèi)型不匹配,只能上傳JPG(JPEG)格式文件\n";
eval("form1.file"+Index+".outerHTML=\"<input
type=\\\"file\\\" name=\\\"file"+Index+"
\\\" style=\\\"width:275\\\"
value=\\\"
\\\" onChange=\\\"FileChange(this);\\\">\"");
eval("form1.file"+Index+".fireEvent(\"onChange\")");
alert("此圖片類(lèi)型不匹配,只能上傳JPG(JPEG)格式文件\n");
return ;
}
tempFileName=image.src;
var iLastDot;
iLastLine=tempFileName.lastIndexOf(‘/‘);
if(iLastLine!=-1){
tempFileName=tempFileName.substring(iLastLine+1,tempFileName.length);
}
if(!CheckIfEnglish(tempFileName)){
image.outerHTML="";
gErr+="此圖片文件名包含中文或其他不合法字符\n文件名只能由‘a(chǎn)-z‘、‘A-Z‘、‘_‘、‘-‘構(gòu)成\n";
eval("form1.file"+Index+".outerHTML=\"<input
type=\\\"file\\\" name=\\\"file"+Index+"
\\\" style=\\\"width:275\\\"
value=\\\"
\\\" onChange=\\\"FileChange(this);\\\">\"");
eval("form1.file"+Index+".fireEvent(\"onChange\")");
alert("此圖片文件名包含中文或其他不合法字符\n文件名只能由‘a(chǎn)-z‘、‘A-Z‘、‘_‘、‘-‘構(gòu)成\n");
return ;
}
if(gErr.length>0){
return;
}
if(image.width>0 && image.height>0){
flag=true;
if(image.width/image.height>= 120/80){
if(image.width>120){
ImgD.width=120;
ImgD.height=(image.height*120)/image.width;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt="圖片大小(寬*高):
"+image.width+"×"+image.height+"\n圖片大小: "+image.fileSize+"\n圖片路徑:
"+image.src;
eval(‘document.all.width‘+Index+‘.value=‘+image.width);
eval(‘document.all.height‘+Index+‘.value=‘+image.height);
var oCreated=new Date(image.fileModifiedDate);
eval(‘document.all.PicUpdateDate‘+Index+‘.value="‘+oCreated.toLocaleString()+‘"‘);
}
else{
if(image.height>80){
ImgD.height=80;
ImgD.width=(image.width*80)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt="圖片大小(寬*高):
"+image.width+"×"+image.height+"\n圖片大小: "+image.fileSize+"\n圖片路徑:
"+image.src;
eval(‘document.all.width‘+Index+‘.value=‘+image.width);
eval(‘document.all.height‘+Index+‘.value=‘+image.height);
var oCreated=new Date(image.fileModifiedDate);
eval(‘document.all.PicUpdateDate‘+Index+‘.value="‘+oCreated.toLocaleString()+‘"‘);
}
}
if(parseInt(Index)==parseInt(form1.upcount.value)){
form1.upcount.value=parseInt(form1.upcount.value)+1;
str+=‘<table width="100%" ><tr valign="middle" ><td
align="center" id="tdimg" height="" width="120" ></td><td
id="tdfile" >文件‘+(parseInt(Index)+1)+‘:<input
onpropertychange="FileChange(this);" type="file"
name="file‘+(parseInt(Index)+1)+‘" style="width:275" ><input
id="width‘+(parseInt(Index)+1)+‘"
name="width‘+(parseInt(Index)+1)+‘" type="hidden" value=""><input
id="height‘+(parseInt(Index)+1)+‘"
name="height‘+(parseInt(Index)+1)+‘" type="hidden" value=""><input
name="PicUpdateDate‘+(parseInt(Index)+1)+‘" type="hidden"
id="PicUpdateDate‘+(parseInt(Index)+1)+‘"></td></tr></table>‘;
window.upid.insertAdjacentHTML("beforeEnd",str+‘<br>‘);
}
gUploadSize+=parseFloat(image.fileSize);
}
//////////////////////////////////////////
function AlbumChange(Value){
if(Value==‘0‘){
document.all.sNewAlbum.style.display=‘inline‘;
document.all.NewAlbum.focus();
}
else{
document.all.sNewAlbum.style.display=‘none‘;
}
return ;
}
function CheckIfEnglish( String )
{
var Letters =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890-_.";
var i;
var c;
if(String.charAt( 0 )==‘-‘)
return false;
if( String.charAt( String.length - 1 ) == ‘-‘ )
return false;
for( i = 0; i < String.length; i ++ )
{
c = String.charAt( i );
if (Letters.indexOf( c ) < 0)
return false;
}
return true;
}
</SCRIPT>
</head>
<body >
<form name="form1" method="post" action="">
<TABLE align=center bgColor=#cccccc border=0
borderColorDark=#cccccc
borderColorLight=#000000
cellPadding=5 cellSpacing=1
height=367
width="500">
<TBODY>
<TR vAlign=center>
<TD align=left bgColor=#ffffff colSpan=2
height=269 id=upid vAlign=top>
<TABLE cellPadding=3 cellSpacing=1 width="100%">
<TBODY>
<TR vAlign=center>
<TD align=middle bgColor=#ffffff id=tdimg
width=120></TD>
<TD bgColor=#ffffff id=tdfile>文件1:
<INPUT
name=file1
onpropertychange=FileChange(this);
style="WIDTH: 275px" type=file>
<INPUT id=width1
name=width1 type=hidden> <INPUT
id=height1
name=height1 type=hidden> <INPUT
id=PicUpdateDate1
name=PicUpdateDate1
type=hidden></TD>
</TR>
</TBODY>
</TABLE></TD>
</TR>
<TR bgColor=#eeeeee vAlign=center>
<TD align=middle bgColor=#ebebeb colSpan=2
height=24> <DIV
align=left>將圖片上傳至已有相冊(cè)
<SELECT id=OldAlbum
name=OldAlbum
onchange=AlbumChange(this.value);>
<OPTION value=0><新建相冊(cè)></OPTION>
<OPTION
selected value=365>臨時(shí)相冊(cè)</OPTION>
</SELECT>
<INPUT
id=TempAlbum name=TempAlbum
type=hidden
value=365>
<SPAN id=sNewAlbum
style="DISPLAY: none">或新建相冊(cè)
<INPUT id=NewAlbum
maxLength=50 name=NewAlbum
onfocus="">
</SPAN></DIV></TD>
</TR>
<TR bgColor=#eeeeee vAlign=center>
<TD align=middle bgColor=#ebebeb colSpan=2
height=24> <DIV align=center><FONT
size=2>
<INPUT class=bt name=Submit onclick=validate();
type=button value="· 上傳已選圖片 ·">
<INPUT id=upcount name=upcount type=hidden
value=1>
<INPUT id=from name=from type=hidden>
</FONT></DIV></TD>
</TR>
</TBODY>
</TABLE>
</form>
</body>
</html>
11，不同的ALT
<SCRIPT language=JavaScript1.2>
<!--
tPopWait=50;
tPopShow=50000;
showPopStep=10;
popOpacity=100;
sPop=null;
curShow=null;
tFadeOut=null;
tFadeIn=null;
tFadeWaiting=null;
document.write("<style type=‘text/css‘id=‘defaultPopStyle‘>");
document.write(".cPopText { background-color: #FFFFFF; border: 1px
#000000 solid; font-size: 12px; padding-right: 4px; padding-left:
4px; height: 20px; padding-top: 2px; padding-bottom: 2px; filter:
Alpha(Opacity=0)}");
document.write("</style>");
document.write("<div id=‘dypopLayer‘
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.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;
//-->
</script>
<img src="images/logo.gif" alt="網(wǎng)頁(yè)教學(xué)網(wǎng)">
