HTML:
<h>文件上传只支持.xlsx格式</h>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="fafafa" accept=".xlsx" onchange="getFileSize(this)">
<input type="submit" value="点击提交" >
<br />
</form>
<p id="file_size"></p>
JS:
<script>
function getFileSize(fileObj)
{
document.getElementById('file_size').innerText='文件大小为:'+fileObj.files[0].size/1024+'kb';
}
</script>