用JavaScript通过C++指定在Excel文件中存储的重要数字位数
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可能的使用场景
默认情况下，Aspose.Cells for JavaScript通过C++在Excel文件中存储17位有效数字的双精度值，不同于只存储15位有效数字的MS-Excel。您可以使用CellsHelper.significantDigits属性将Aspose.Cells的默认行为从17位有效数字更改为15位有效数字。
指定要在Excel文件中存储的有效数字
以下示例代码强制Aspose.Cells在存储双精度值时使用15个有效数字。请查看输出Excel文件。将扩展名改为.zip，解压后即可看到文件中只存储了15个有效数字。下图说明了 CellsHelper.significantDigits 属性对输出Excel文件的影响。
示例代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Aspose.Cells Example - Significant Digits</title>
</head>
<body>
<h1>Significant Digits Example</h1>
<p>This example sets CellsHelper.significantDigits to 15 and writes a double to cell A1.</p>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, CellsHelper } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
// If a file is provided, open it; otherwise create a new workbook (matches original Node behavior)
let workbook;
if (fileInput.files.length) {
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
workbook = new Workbook(new Uint8Array(arrayBuffer));
} else {
workbook = new Workbook();
}
// By default, Aspose.Cells stores 17 significant digits unlike MS-Excel which stores only 15 significant digits
CellsHelper.significantDigits = 15;
// Access first worksheet
const worksheet = workbook.worksheets.get(0);
// Access cell A1
const c = worksheet.cells.get("A1");
// Put double value, only 15 significant digits as specified by CellsHelper.significantDigits above will be stored
c.value = 1234567890.123451711;
// Saving the workbook
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'out_SignificantDigits.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Workbook created/modified successfully! Click the download link to get the file.</p>';
});
</script>
</html>