JavaScript/HTML5를 사용하여 Excel(XLS) 파일을 JSON 형식으로 구문 분석하는 방법은 무엇입니까?

<code class="html"><script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js"></script></code>

<code class="javascript">var ExcelToJSON = function() {

  this.parseExcel = function(file) {
    var reader = new FileReader();

    reader.onload = function(e) {
      var data = e.target.result;
      var workbook = XLSX.read(data, {
        type: 'binary'
      });

      workbook.SheetNames.forEach(function(sheetName) {
        // Convert sheet to row object array
        var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);

        // Convert to JSON
        var json_object = JSON.stringify(XL_row_object);

        // Output JSON object
        console.log(json_object);
      })

    };

    reader.onerror = function(ex) {
      console.log(ex);
    };

    reader.readAsBinaryString(file);
  };
};</code>