How to get the size of uploaded file using js

HTML：

js获取上传文件的大小：
        <input id="uploadFile" type="file" name="myPhoto"/> 
        <button id="btnConfirm" class="btn" onclick="checkFile()">确认上传</button>

JS：

<script>
        function checkFile() {
          //获取文件 
          var file = document.getElementById("uploadFile").files[0];          
          var vv=file.size;//文件的字节数
          alert(vv)
        }; 
    </script>

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