源码：
function resize(img, width, height) {
(img.width > img.height)
? ((img.height = Math.min(height, width * img.height/img.width)) || (img.width = Math.min(width, img.width)))
: ((img.width = Math.min(width, height * img.width/img.height)) || (img.height = Math.min(height, img.height)));
}
稍微压缩一下：
function resize1(i,w,h){var a=i.width;var b=i.height;a>b?((i.height=Math.min(h,w*b/a))||(i.width=Math.min(w,a))):((i.width=Math.min(w,h*a/b))||(i.height = Math.min(h,b)));}
Javascript中常用的经典技巧
1. oncontextmenu="window.event.returnValue=false"
将彻底屏蔽鼠标右键
<table border oncontextmenu=return(false)><td>no</table>
可用于Table
2. <body onselectstart="return false">
取消选取、防止复制
3. onpaste=&quo ......
