JS剪切板应用clipboardData实例解析

<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>利用clipboardData在网页中实现截屏粘贴的功能</title>
<style type="text/css">
  .box{ width:500px; height:300px; border:1px solid #ddd; }
  .box img{max-width:480px; max-height: 100%; text-align: center;}
</style>
</head>
<body>
<div class="box" contenteditable="true" id="testInput">
</div>
<script type="text/javascript">
(function(){
  var imgReader = function( item ){
    var blob = item.getAsFile(),
      reader = new FileReader();
    reader.onload = function( e ){
      var img = new Image();
      img.src = e.target.result;
      console.log(img);
      document.getElementById('testInput').appendChild( img );
    };
    reader.readAsDataURL( blob );
  };

  document.getElementById( 'testInput' ).addEventListener( 'paste', function( e ){
    //window.clipboardData.getData("Text") ie下获取黏贴的内容 e.clipboardData.getData("text/plain")火狐谷歌下获取黏贴的内容
    //alert(e.clipboardData.getData("text/plain") )
    var clipboardData = e.clipboardData,//谷歌
      i = 0,
      items, item, types;
       console.log('0')

    if( clipboardData ){
       console.log('1')
      items = clipboardData.items;
      if( !items ){
        console.log(2)
        return;
      }
      console.log(3)
      item = items[0];
      types = clipboardData.types || [];
      for( ; i < types.length; i++ ){
        if( types[i] === 'Files' ){
          item = items[i];
          break;
        }
      }
      if( item && item.kind === 'file' && item.type.match(/^image\//i) ){
        imgReader( item );
      }
     }
   },false);
})(); 
</script>


</script>

</body>
</html> 

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
 <div id="div" style="width:100%;height:700px;border:1px solid #ccc;padding:20px" contenteditable="true"></div>
 <script>
  var div = document.getElementById('div');
  div.addEventListener('paste', function(e) {
   if(e.clipboardData) {
    for(var i = 0; i < e.clipboardData.items.length; i++) {
     var c = e.clipboardData.items[i];
     var f = c.getAsFile();
     var reader = new FileReader();
     reader.onload = function(e) {
      div.innerHTML += '<img src="' + e.target.result + '">';
     }
     reader.readAsDataURL(f);
    }
   }
  });
 </script>
</body>
</html>