js implements obtaining the size of uploaded files with specified precision, mainly using html and JavaScript. Use the browser to run the following code and follow the operation: select file->get the order of file size.
Source code:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>获得文件大小</title>
</head>
<body>
<form type="testForm" id="test">
<input type="file" id="testFile">
<input type="button" id="tstBtn" value="获得文件大小" onclick="getSize();"/>
</form>
<script type="text/javascript">
function getSize(){
var elt=document.getElementById("testFile");//获得文件对象
var len=elt.files[0].size/1024;//获得文件大小并转化为KB单位,采用默认的精度
document.write("文件大小: "+len.toFixed(2)+"KB");//输出指定精度的文件大小,这里是精度是两位小数
}
</script>
</body>
</html>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
