问题
I'm trying to display some large images with HTML img tags. At the moment they go off the edge of the screen; how can I scale them to stay within the browser window?
Or in the likely event that this is not possible, is it possible to at least say "display this image at 50% of its normal width and height"?
The width and height attributes distort the image -- as far as I can tell, this is because they refer to whatever attributes the container may end up with, which will be unrelated to the image. I can't specify pixels because I have to deal with a large collection of images each with a different pixel size. Max-width doesn't work.
回答1:
Only set the width or height, and it will scale the other automatically. And yes you can use a percentage.
The first part can be done, but requires JavaScript, so might not work for all users.
回答2:
css is enough :
width : desired_width;
height: auto;/*to preserve the aspect ratio of the image*/
回答3:
No Javascript required.
IE6 Internet Explorer 6
Percent only works for the width of an element, but height:100%; does not work without the correct code.
CSS
html, body { height:100%; }
Then using a percentage works properly, and dynamically updates on window resize.
<img src="image.jpg" style="height:80%;">
You do not need a width attribute, the width scales proportionately as the browser window size is changed.
And this little gem, is in case the image is scaled up, it will not look (overly) blocky (it interpolates).
img { -ms-interpolation-mode: bicubic; }
Props go to this source: Ultimate IE6 Cheatsheet: How To Fix 25+ Internet Explorer 6 Bugs
回答4:
Adding max-width: 100%; to the img tag works for me.
回答5:
I think the best solution is resize the images via script or locally and upload them again. Remember, you're forcing your viewers to download larger files than they need
回答6:
The best way I know how to do this, is:
1) set overflow to scroll and that way the image would stay in but you can scroll to see it instead
2) upload a smaller image. Now there are plenty of programs out there when uploading (you'll need something like PHP or .net to do this btw) you can have it auto scale.
3) Living with it and setting the width and height, this although will make it look distorted but the right size will still result in the user having to download the full-sized image.
Good luck!
来源：https://stackoverflow.com/questions/1347675/html-img-scaling