代碼如下:<html> <head> <title>Upload Image</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> </head> <body bgcolor="#FFFFFF" text="#000000"> <form name="IUpload" action="upfile.asp" method="post"> <p><input type="file" name="picsrc" size="40" onchange="picshow.src=document.IUpload.picsrc.value"> <input type="button" value="上載" onclick="detect()"></p></form> <p><img name="picshow" src="http://51js.1000box.net/pics/face/19.gif" title="圖像預覽"></p> </body> </html> <SCRIPT LANGUAGE="JavaScript"> <!-- function imgExceedSize(w,h){ if(!document.IUpload.picsrc.value==""){ if(picshow.width>w||picshow.height>h){ alert("圖像尺寸:"+picshow.width+"X"+picshow.height+"。\\n圖像尺寸過大!你只能上傳尺寸為 "+w+"×"+h+"的圖像,請重新瀏覽圖片!"); return true; }else{ return false; } }else{ return true; } } function detect(){ var ok=imgExceedSize(50,50); if(ok){ document.IUpload.reset(); }else{ document.IUpload.submit(); } } //--> </SCRIPT> [Ctrl+A 全選 提示:你可先修改部分代碼,再點運行代碼]
原文轉自:http://www.kjueaiud.com