<span class="upload-span">开始上传文件</span>
<button>太丑了，就用span来做了，可控性强。添加点css:
.upload-span{
  display: inline-block;
  width: 120px;
  height: 40px;
  color: #FFFFFF;
  text-align: center;
  line-height: 40px;
  background-color: blue;
  border: 2px solid blue;
  border-radius:5px;
  cursor: pointer;
  letter-spacing: 2px;
}

 <div class="upload-mask"></div>
  <div class="upload-component">
    <div class="upload-close">
      <span class="upload-close-span">关闭</span>
    </div>
    <div class="upload-content">
      <div class="progress">
        <span class="upload-text"></span>
        <span class="uploaded"></span>
      </div>
      <div class="confirm-cancel">
        <span class="confirm">确认</span>
        <span class="cancel">取消</span>
      </div>
    </div>
  </div>

.upload-mask{
  position: absolute;
  top: 0;
  left: 0;
  z-index: 9;
  width: 100%;
  height: 100%;
  background-color: rgba(84,84,84,0.3);
  display: none;
}
.upload-component{
  position: absolute;
  z-index: 99;
  top: 50%;
  left: 50%;
  margin-left: -120px;
  margin-top: -60px;
  width: 240px;
  height: 120px;
  background-color: #FFFFFF;
  display:none;
}
.upload-close{
  position: relative;
  height: 30px;
  background-color: rgb(234,234,234);
}
.upload-close span{
  position: absolute;
  right: 15px;
  line-height: 30px;
  cursor: pointer;
}
.upload-content,.confirm-cancel{
  margin-top: 15px;
}
.progress{
  position:relative;
  width:90%;
  height:22px;
  margin-left: 4.88888%;
  text-align: center;
  line-height: 22px;
  /*background-color: blue;*/
  border:1px solid #ccc;
}
.upload-text{
  position:absolute;
  z-index: 99999;
  color:red;
}
.uploaded{
  position:absolute;
  left:0;
  z-index: 9999;
  width:0%;
  height:100%;
  background-color: blue;
  color:#FFFFFF;
}
.confirm-cancel span{
  display:inline-block;
  width:60px;
  height:30px;
  line-height: 30px;
  text-align: center;
  /*cursor:pointer;*/
  background-color:#ccc;
  cursor:wait;
}
.confirm{
  /*background-color: rgb(111,197,293);*/
  margin-left:40%;
}
.cancel{
  /*background-color: rgb(175,194,211);*/
  margin-left: 10px;
}

<div class="progress">
  <span class="upload-text"></span>
  <span class="uploaded"></span>
</div>

.upload-text{
  position:absolute;
  z-index: 99999;
  color:red;
}
.uploaded{
  position:absolute;
  left:0;
  z-index: 9999;
  width:0%;
  height:100%;
  background-color: blue;
  color:#FFFFFF;
}

  // 模拟进度
  function progressBar() {
    var max = 100;
    var init = 0;
    var uploaded;
    var test = setInterval(function() {
      init += 10;
      uploaded = parseInt((init / max * 100)) + '%';
      $uploadTextSpan.text(uploaded).next().css({
  width:uploaded
  });
  if (init === 100) {
  clearInterval(test);
  $uploadTextSpan.text('上传完成');
  $('.confirm-cancel span').css({
   cursor:'pointer'
  });
  $('.confirm').css({
   backgroundColor:'rgb(111,197,293)'
  });
  $('.cancel').css({
   backgroundColor:'rgb(175,194,211)'
  })
  $closeConfirmCancel.on('click',closeConfirmCancel);
  } 
  else { 
  $closeConfirmCancel.off('click',closeConfirmCancel);
  $('.upload-close-span').on('click',function(){
   clearInterval(test);
   closeConfirmCancel();
  });
  $uploadMask.on('click',function() {
          clearInterval(test);
          closeConfirmCancel();
        })
      }
    },1000);
  }