问HTML5文件应用程序接口，支持多个文件顺序执行，而不是一次执行所有文件

EN

// The multiUp function will be called each time our hidden input is changed
document.querySelector('input').addEventListener('change', multiUp, false);

function multiUp(e){
  // if it's the first time we call it
  if(!this.multiFiles){
    // create the array that will keep our files in memory
    this.multiFiles = [];
    // add a pointer to the span where we'll display the file names
    this.__fileHolder = document.querySelector('#fileHolder');
    }
  // each time : empty the fileHolder span
  this.__fileHolder.innerHTML = '';
  var i;
  // add the new files to our array
  for(i = 0; i<this.files.length; i++){
    this.multiFiles.push(this.files[i]);
    }

  for(i = 0; i<this.multiFiles.length; i++){
    // display every file name to our fileHolder
    this.__fileHolder.appendChild(document.createTextNode(this.multiFiles[i].name) );
    // add a button to remove the file from the list
    addDeleteBtn(i, this);
    }
  }

// Tell the add span to act as a trigger to our input
document.querySelector('#add').addEventListener('click', function(){ document.querySelector('input').click()}, false);

function addDeleteBtn(f, input){
  // create the element
  var del= document.createElement('span');
  del.innerHTML = ' (x) ';
  del.className = 'deleteBtn';
  del.title = 'remove this file';
  // add an onclick event
  del.addEventListener('click', function(){
    // update the array
    input.multiFiles.splice(f, 1);
    // update the fileHodler
    input.__fileHolder.innerHTML = '';
    var fileLength = input.multiFiles.length;
    if(fileLength>0){
      for(var i = 0; i<fileLength; i++){
        input.__fileHolder.appendChild(document.createTextNode(input.multiFiles[i].name) );
        addDeleteBtn(i, input);
        }
      }
    else input.__fileHolder.innerHTML = 'No files selected.';
    }, false);
  input.__fileHolder.appendChild(del);
  }

#add{ font-size: 2em; cursor: pointer;}
#fileHolder{ color: rgba(0,0,0,.7); max-width: 80%; font-size: 70%; overflow-x: auto; white-space: nowrap; display: inline-block;}
.deleteBtn{cursor: pointer; color: #000;}

<div class="multiUp">
<span id="add">+</span>
<span id="fileHolder">No files selected.</span>
<input multiple type="file" style="display: none"/>
</div>