如何用 JavaScript 设置点为总数，使用 C++
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Excel图表中的"设为总和"是什么意思
在某些 Excel 图表中，例如瀑布图，一些点数据是前面点的总和，你可能需要“设置点为总计”。我们将展示示例代码和下面的说明。
瀑布图需要 “设置点为总计”
此图片显示了 Excel 中的瀑布图。可以看到有四个以“Total”开头的数据点，用于统计之前所有数据点。在此图片中，设置可能不完全正确。当我们选择“Total 2024”这一点时，可以看到“设置为总数”选项在 Excel 中未被勾选。下面附有需要修改的示例 Excel 文件，我们将利用 Aspose.Cells for JavaScript 通过 C++ 正确设置。
使用 Aspose.Cells for JavaScript 通过 C++ “设置点为总数”
我们使用以下代码来正确设置文件：
<!DOCTYPE html>
<html>
<head>
<title>Set Chart Subtotals Example</title>
</head>
<body>
<h1>Set Chart Subtotals Example</h1>
<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, Worksheet, Cell } = 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');
const resultDiv = document.getElementById('result');
if (!fileInput.files.length) {
resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiating a Workbook object from the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Accessing the first worksheet in the Excel file
const worksheet = workbook.worksheets.get(0);
// Accessing the chart named "Graphiq5"
const chart = worksheet.charts.get("Graphiq5");
// set some points as total column
// In this example, we set points 0, 4, 8, 12 as total
chart.nSeries.get(0).layoutProperties.subtotals = [0, 4, 8, 12];
// Saving the modified Excel file
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
resultDiv.innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>
你可以得到以下正确的输出文件
如下图所示，四个"总和"数据点已正确设置，你可以看到与之前图表的区别。
