現在想要實現的是：
1、如果圖片小于當前瀏覽器窗口寬度，則顯示當前大小
2、如果圖片超過當前瀏覽器窗口寬度，則顯示瀏覽器窗口寬度-50px的寬度
高度都是自適應的（即按比例縮小）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title><style>*{margin:0;padding:0;}#fontzoom{width:100%;overflow:hidden;}</style><script>function $(id){ return document.getElementById(id);}function autoResizepic(){ var bodywidth = $('fontzoom').style.width; bodywidth =document.body.scrollWidth var picTarget=$('fontzoom').getElementsByTagName('img'); if(picTarget.length>0) { for(var i =0;i<picTarget.length;i++) { if(picTarget[i].width>bodywidth) {picTarget[i].width=bodywidth-50;} if(picTarget[i].width<bodywidth) {picTarget[i].width=bodywidth-50;} } }}window.onresize=autoResizepic;</script></head> <body><div id="fontzoom"> <img src="http://read.91move.com/pics/nuojiya/6630/200607/02/0114370.jpg" /> <img src="http://read.91move.com/pics/nuojiya/6630/200607/02/0114370.jpg" /></div> <script>autoResizepic();</script></body></html>
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