根据@耶的建议下，我才得以prevent输入到文件上传的未经处理对上传的关键preSS 事件。使用jQuery：

As per @Jer's suggestion, I was able to prevent input into the file upload without breaking any of the other functionality by handling keypress events on the upload. Using jQuery:

$(document).ready() {
    $('input:file').keypress(function() {
      return false;
    });
}