HTML+JS 实现文件上传，文件读取

纯js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

	
		<input id="upfile" name="upfile" type="file" multiple="multiple" />

		<div id="result"></div>
	
<script type="text/javascript">

	 document.getElementById("upfile").addEventListener("change",function () {

		var file = document.getElementById('upfile').files[0];

		console.log(file);

		var reader = new FileReader();

		console.log(reader);
            
        reader.readAsText(file,'utf-8');

 			reader.onload = function () {
                document.getElementById('result').innerHTML = reader.result;
            }
    });

	
	

</script>
</body>
</html>
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