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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<input type='file' accept='text/plain' onchange='openFile(event)'><br>
<div id="output"></div>
</body>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
var openFile = function(event) {
var input = event.target;
var reader = new FileReader();
reader.onload = function() {
if(reader.result) {
//显示文件内容
$("#output").html(reader.result);
}
};
reader.readAsText(input.files[0]);
};
</script>
</html>