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javascript判断上传文件大小

<!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" xml:lang="en"><head>    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">    <title>Document</title></head><body>    <input type="file" id="btnFile" /></body></html><script>    var btn = document.getElementById(‘btnFile‘);    btn.onchange = function(){    getSize(this);    function getSize(t){        var size;        if(t.files){            size = parseInt( t.files[0].size / 1024 /1024,10);        }else{            size = parseInt( new ActiveXObject("Scripting.FileSystemObject").GetFile(t.value).size / 1024/1024,10 );        }        if( size >= 2){            alert(‘文件过大‘);        }    };</script>

 

javascript判断上传文件大小