JavaScript는 어떻게 다른 브라우저에서 로컬 파일 내용을 읽을 수 있습니까?

function getFileContents() {
    var fileForUpload = document.forms[0].fileForUpload;
    var fileName = fileForUpload.value;

    if (fileForUpload.files) {
        var fileContents = fileForUpload.files.item(0).getAsBinary();
        document.forms[0].fileContents.innerHTML = fileContents;
    }
}

function ieReadFile(filename) 
{
    try
    {
        var fso  = new ActiveXObject("Scripting.FileSystemObject"); 
        var fh = fso.OpenTextFile(filename, 1); 
        var contents = fh.ReadAll(); 
        fh.Close();
        return contents;
    }
    catch (Exception)
    {
        return "Cannot open file :(";
    }
}

var file = document.getElementById("fileForUpload").files[0];
if (file) {
    var reader = new FileReader();
    reader.readAsText(file, "UTF-8");
    reader.onload = function (evt) {
        document.getElementById("fileContents").innerHTML = evt.target.result;
    }
    reader.onerror = function (evt) {
        document.getElementById("fileContents").innerHTML = "error reading file";
    }
}