Description link
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<html xmlns="http://www.w3.org/1999/xhtml"> -
<head> -
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<meta name="DEscription" contect="my code demo" /> -
<meta name="Author" contect="[email protected]" /> -
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> -
<meta http-equiv="X-UA-Compatible" content="IE=emulateIE8"> -
<title>js check file size @ jb51.net</title> -
</head> -
<body> -
< img id="tempimg" dynsrc="" src="" style="display:none" /> -
<input type="file" name="file" id="fileuploade" size="40" /> -
<input type="button" name ="check" value="checkfilesize" οnclick="checkfile()"/> -
</body> -
<script type="text/javascript"> -
var maxsize = 210241024;//2M -
var errMsg = "上传的附件文件不能超过2M！！！"; -
var tipMsg = "您的浏览器暂不支持计算上传文件的大小，确保上传文件不要超过2M，建议使用IE、FireFox、Chrome浏览器。"; -
var browserCfg = {}; -
var ua = window.navigator.userAgent; -
if (ua.indexOf("MSIE")>=1){ -
browserCfg.ie = true; -
}else if(ua.indexOf("Firefox")>=1){ -
browserCfg.firefox = true; -
}else if(ua.indexOf("Chrome")>=1){ -
browserCfg.chrome = true; -
} -
function checkfile(){ -
try{ -
var obj_file = document.getElementById("fileuploade"); -
if(obj_file.value==""){ -
alert("请先选择上传文件"); -
return; -
} -
var filesize = 0; -
if(browserCfg.firefox || browserCfg.chrome ){ -
filesize = obj_file.files[0].size; -
}else if(browserCfg.ie){ -
var obj_img = document.getElementById('tempimg'); -
obj_img.dynsrc=obj_file.value; -
filesize = obj_img.fileSize; -
alert(filesize); -
}else{ -
alert(tipMsg); -
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return; -
} -
if(filesize==-1){ -
alert(tipMsg); -
return; -
}else if(filesize>maxsize){ -
alert(errMsg); -
return; -
}else{ -
alert("文件大小符合要求"); -
alert(filesize); -
return; -
} -
}catch(e){ -
alert(e); -
} -
} -
</script> -
</html>