使用JavaScript通过C++解除工作表保护
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如果开发人员需要在运行时从受保护的工作表中移除保护，以便对文件进行一些更改？这可以很容易地通过Aspose.Cells完成。
取消保护工作表
使用Microsoft Excel
要取消工作表的保护：
从工具菜单中，选择保护然后取消保护工作表。除非工作表设置了密码，否则保护将会被移除。在这种情况下，会弹出对话框要求输入密码。输入密码后，工作表将被取消保护。
使用Aspose.Cells取消简单保护的工作表
可以通过调用Worksheet类的unprotect()方法来取消保护工作表。一个简单保护的工作表是不设置密码保护的。这类工作表可以通过调用unprotect()方法（不传递参数）来取消保护。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Aspose.Cells Unprotect Worksheet 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));
// Accessing the first worksheet in the Excel file
const worksheet = workbook.worksheets.get(0);
// Unprotecting the worksheet without a password
worksheet.unprotect();
// Saving the Workbook in Excel97To2003 format
const outputData = workbook.save(SaveFormat.Excel97To2003);
const blob = new Blob([outputData], { type: "application/vnd.ms-excel" });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.xls';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Unprotected Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Worksheet unprotected successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>
使用Aspose.Cells取消受密码保护的工作表
受密码保护的工作表是用密码保护的工作表。这类工作表可以通过调用unprotect()方法的重载版本（带有密码参数）来取消保护。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Unprotect Worksheet 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 uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Accessing the first worksheet in the Excel file
const worksheet = workbook.worksheets.get(0);
// Unprotecting the worksheet with a password (empty password in original code)
worksheet.unprotect("");
// Saving the modified Excel file
const outputData = workbook.save(SaveFormat.Excel97To2003);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output.out.xls';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Worksheet unprotected successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>