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              <h3>Demo1:选取一张图片,并预览</h3>	
<input id="img_input" type="file" accept="image/*"/>
	<label for="img_input"></label>
	<div class="preview_box"></div>

<hr />

<h3>Demo2:拖拽上传</h3>

<div id="drop_zone">Drop files here</div>
<output id="list"></output>

<hr />

<h3>Demo3:label样式</h3>

							<input id="img_input2" type="file" accept="image/*"/>
							<label for="img_input2" id="img_label2">选择文件
                  <i class="fa fa-plus fa-lg"></i></label>
	<div id="preview_box2"></div>
            
          
!
            
              /*
 * Demo1:选取一张图片,并预览
 */
.preview_box img {
  width: 200px;
}

/*
 * Demo2:拖拽上传
 */ 
#drop_zone {
  width: 300px;
  height: 200px;
  border: 1px solid #000;
}

/*
 * Demo3:label样式
 */
#img_input2 {
  display: none;
}
#img_label2 {
  background-color: #f2d547;
  border-radius: 5px;
  display: inline-block;
  padding: 10px;
}
#preview_box2 img {
  width: 200px;
}
            
          
!
            
              /*
 * Demo1:选取一张图片,并预览
 */
$("#img_input").on("change", function(e) {

  var file = e.target.files[0]; //获取图片资源

  // 只选择图片文件
  if (!file.type.match('image.*')) {
    return false;
  }

  var reader = new FileReader();

  reader.readAsDataURL(file); // 读取文件

  // 渲染文件
  reader.onload = function(arg) {

    var img = '<img class="preview" src="' + arg.target.result + '" alt="preview"/>';
    $(".preview_box").empty().append(img);
  }
});

/*
 * Demo2:拖拽上传
 */
// 必须阻止dragenter和dragover事件的默认行为,这样才能触发 drop 事件
function handleFileSelect(evt) {
  evt.stopPropagation();
  evt.preventDefault();

  var files = evt.dataTransfer.files; // 文件对象

  // 处理多文件
  var output = [];
  for (var i = 0, f; f = files[i]; i++) {
    output.push('<li><strong>', escape(f.name), '</strong> (', f.type || 'n/a', ') - ',
      f.size, ' bytes, last modified: ',
      f.lastModifiedDate.toLocaleDateString(), '</li>');
  }
  // 显示文件信息
  document.getElementById('list').innerHTML = output.join('');
}

function handleDragOver(evt) {
  evt.stopPropagation();
  evt.preventDefault();
  evt.dataTransfer.dropEffect = 'copy';
}

// Setup the dnd listeners.
var dropZone = document.getElementById('drop_zone');
dropZone.addEventListener('dragover', handleDragOver, false);
dropZone.addEventListener('drop', handleFileSelect, false);

/*
 * Demo3:label样式
 */
$("#img_input2").on("change", function(e) {

  var file = e.target.files[0]; //获取图片资源

  // 只选择图片文件
  if (!file.type.match('image.*')) {
    return false;
  }

  var reader = new FileReader();

  reader.readAsDataURL(file); // 读取文件

  // 渲染文件
  reader.onload = function(arg) {

    var img = '<img class="preview" src="' + arg.target.result + '" alt="preview"/>';
    $("#preview_box2").empty().append(img);
  }
});
            
          
!
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