小编Jam*_*aia的帖子

这对我有用.但我不确定.attr是否会增加价值

$(function() {
  $("input.upb").change(function (){
    var fileName = $(this).val();
    $(".added").html("Selected file(s) was added successfully").css("color","darkgreen").attr("id", "added");
  });
});

这个陈述拼错了吗？

$(function(){
  if($("input.upb").attr("id")=='added'){
    $("input.post").click(function (){
      $(".post").attr("value","Uploading ...");
      $(".progressbar").css("opacity", 1);
    });
  }
});

如果声明不起作用:-(