JavaScript 实现 Ctrl+V 粘贴图片到网页

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>图片粘贴</title>
 <style>
  #img{
   width: 500px;
  }
 </style>
 <img id="img" src="" alt="">
 通过Ctrl + v将图片粘贴
</head>
<body>
 <script>
  setPasteImg();
  //获取粘贴板上的图片
  function setPasteImg(){
   //粘贴事件
   document.addEventListener('paste', function(event){
    if (event.clipboardData || event.originalEvent) {
     var clipboardData = (event.clipboardData || event.originalEvent.clipboardData);
     if(clipboardData.items){
      var blob;
      for (var i = 0; i < clipboardData.items.length; i++) {
       if (clipboardData.items[i].type.indexOf("image") !== -1) {
        blob = clipboardData.items[i].getAsFile();
       }
      }
      var render = new FileReader();
      render.onload = function (evt) {
       //输出base64编码
       var base64 = evt.target.result;
       document.getElementById('img').setAttribute('src',base64);
      }
      render.readAsDataURL(blob);
     }
 
    }
 
   })
 
  }
 
 </script>
</body>
</html>