<script language=javascript>
var flag=false;
function drawimage(imgd){
var image=new image();
image.src=imgd.src;
if(image.width>0 && image.height>0){
flag=true;
if(image.width/image.height>=500/400){
if(image.width>500){
imgd.width=500;
imgd.height=(image.height*500)/image.width;
}else{
imgd.width=image.width;
imgd.height=image.height;
}
}
else{
if(image.height>400){
imgd.height=400;
imgd.width=(image.width*400)/image.height;
}else{
imgd.width=image.width;
imgd.height=image.height;
}
}
}
}
</script>
调用方式(img是显示图片的html代 ) <img src= temp.jpg border=0 onload=javascript:drawimage(this);>
修改后:
<script language=javascript>
var flag=false; //控制小图
function drawimage(imgd,maxwidth,maxheight){
var image=new image();
image.src=imgd.src;
if(image.width>0 && image.height>0){
flag=true;
if(image.width/image.height>=maxwidth/maxheight){
if(image.width>maxwidth){
imgd.width=maxwidth;
imgd.height=(image.height*maxwidth)/image.width;
}else{
imgd.width=image.width;
imgd.height=image.height;
}
}
else{
if(image.height>maxheight){
imgd.height=maxheight;
imgd.width=(image.width*maxheight)/image.height;
}else{
imgd.width=image.width;
imgd.height=image.height;
}
}
}
}
</script>
呵呵,多了两个参数,也就是你能够接受的最大宽度maxwidth与最大高度maxheight