<!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=gb2312" /><title>js判断上传文件大小</title></head>
<body>//方法一
<input type="file" name="file1" onchange="showsize(this.value)"> <script language="网页特效"> <!-- function showsize(files) { var fso,f; fso=new activexobject("scripting.filesystemobject"); f=fso.getfile(files); if(f.size>1024*4){alert(f.size+" bytes"); }} //--> </script> 方法二 js判断上传文件大小
<script type="text/javascript"> function chksize(strfilename){ try { var maxsize = 100; //定义允许文件的大小，单位kb，请根据需要自行修改！ var objstream = new activexobject("adodb.stream"); objstream.type = 1; objstream.open(); objstream.loadfromfile(strfilename); if(math.round(objstream.size/1024)>maxsize) {alert ("抱歉！您选择的文件为 "+math.round(objstream.size/1024,2)+" kb n超过了程序"+maxsize+" k(www.111cn.net)b 的限制！"); document.form1.reset(); return false; } else alert("可以上传"); }catch(e) { alert("不支持"); } }</script><form name="form1" action="" method="post"><input type="file" name="upfile" onchange="chksize(this.value)" />//方法三
<script> function getfilesize (filename) { if (document.all) { window.oldonerror = window.onerror; window.onerror = function (err) { if (err.indexof('utomation') != -1) { alert('没有访问文件的权限'); return true; } else return false; }; var fso = new activexobject('scripting.filesystemobject'); var file = fso.getfile(filename); window.onerror = window.oldonerror; return file.size; }} </script> </head> <form name="formname"><input type="file" name="filename"><br> <input type="button" value="查看文件字节大小" onclick="alert(getfilesize(this.form.filename.value))"><br> </form>
</body></html>from:http://www.111cn.net/wy/js-Ajax/34564.htm
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