xmlhttprequest无法查找文件但存在

Question

我只想问我是否正确执行代码：

function Type2() {
    var txtFile = new XMLHttpRequest();
    txtFile.open("GET", "file://C:/Users/MyPC/Documents/My Reports/Hello.txt", true);

    txtFile.onreadystatechange = function () {
        alert('inside function');
        if (txtFile.readyState === 4) {  // Makes sure the document is ready to parse.
            alert('readystate');
            if (txtFile.status === 200) {  // Makes sure it's found the file.
                alert('file was found');
                allText = txtFile.responseText;
                alert(allText);
            } else {alert('no file was found');    }
        } else { alert('no readystate'); }
    }
    txtFile.send(null);
 }

每次触发时，它都会显示readystate和no such file was found，但文件仍然存在。代码有问题吗？用我的URL？我做得对吗？我很抱歉，我是网络开发的新手。谢谢你的回复。