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A simple example of using JavaScript to obtain the size of an uploaded file with specified precision

高洛峰
高洛峰Original
2016-12-09 10:22:531299browse

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>


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