使用 C++ 通过 JavaScript 移除工作簿中未使用的样式
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未使用的样式不仅占用空间，还会在转换为PDF、HTML等不同格式时引发性能问题。Aspose.Cells提供了Workbook.removeUnusedStyles()以删除工作簿内所有未使用的样式。
以下代码说明了Workbook.removeUnusedStyles()的用法。该代码加载了模板Excel文件，可以通过提供的链接下载。它包含一个名为AsposeStyle的未使用样式；执行后，此样式及所有其他未使用样式将被删除。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example - Remove Unused Styles</title>
</head>
<body>
<h1>Remove Unused Styles 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, Utils } = 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 (!fileInput.files.length) {
document.getElementById('result').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));
// Remove all unused styles inside the workbook
workbook.removeUnusedStyles();
// Save the modified workbook as XLSX and provide a download link
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output_out.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Unused styles removed successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>