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jQuery implements preview function when uploading pictures

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Release： 2018-04-20 17:10:20
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This time I will bring you jQuery to implement the preview function when uploading pictures. What are the precautions for jQuery to implement the preview function when uploading pictures? The following are Let’s take a look at practical cases. 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jquery上传图片本地预览效果</title>
</head>
<body>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
<input id="upload" type="file">
<img id="preview" src="">
<script type="text/javascript">
$('#upload').change(function(){
  // 获取FileList的第一个元素
  alert(document.getElementById('upload').files[0]);
  var f = document.getElementById('upload').files[0];
  src = window.URL.createObjectURL(f);
  document.getElementById('preview').src = src
})
</script>
</body>
</html>
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