经常看到一些图片很大，上传后显示会撑满屏幕下面的例子通过检测if(this.width>screen.width-
原图<br>
<img src="jsimg/wallpaper.jpg"><br>
设定大小的图<br>
<img src="jsimg/wallpaper.jpg" onload="javascript:if(this.width>screen.width-350)this.width=screen.width-350">
原图<br>
<img src="jsimg/wallpaper.jpg"><br>
设定大小的图<br>
<img src="jsimg/wallpaper.jpg" onload="javascript:if(this.width>screen.width-350)this.width=screen.width-350">