挺有用的一个网页应用，主要功能是将LRC歌词格式转换为STR字幕格式，同时提供Base64解码工具。
主要功能
1. LRC转STR转换器
-
输入：用户可以粘贴LRC歌词或上传LRC文件
-
转换：点击”转换为STR”按钮将LRC转换为STR格式
-
输出：显示转换后的STR字幕，可下载或保存
2. Base64解码工具
-
支持解码Base64编码的文本
-
可选择不同编码格式(UTF-8, GBK, Big5)
-
提供复制解码结果的功能
技术实现
-
前端框架：使用jQuery简化DOM操作
-
界面布局：采用Flexbox实现响应式布局
-
核心功能：
-
LRC解析：使用正则表达式提取时间标签和歌词文本
-
时间格式转换：将LRC时间格式(mm:ss.xx)转换为STR时间格式(hh:mm:ss,mmm)
-
文件处理：支持文件上传和下载
-
Base64解码：使用浏览器内置的
atob()函数
-
-
用户体验优化：
-
添加了提示框(toast)显示操作反馈
-
改进了复制功能，支持现代Clipboard API和传统方法
-
提供文件导入/导出功能
-
使用场景
这个工具适合需要将音乐歌词(LRC格式)转换为视频字幕(STR格式)的用户，例如：
-
音乐视频制作者
-
卡拉OK系统开发者
-
需要处理字幕格式转换的用户
Base64解码工具可以作为辅助功能，用于处理编码的文本内容。
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>LRC↔STR双向转换工具</title>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.7.1/jszip.min.js"></script>
<style>
.container { display: flex; gap: 20px; padding: 20px; }
.section { flex: 1; border: 1px solid #ccc; padding: 15px; border-radius: 5px; }
textarea { width: 100%; height: 200px; margin: 10px 0; padding: 5px; font-family: Arial; }
button { background: #4CAF50; color: white; border: none; padding: 8px 15px; border-radius: 4px; cursor: pointer; margin-right: 10px; }
button:hover { background: #45a049; }
.file-name { width: 150px; margin-left: 5px; padding: 4px; border: 1px solid #ccc; border-radius: 4px; }
.file-input-label { display: inline-block; padding: 6px 12px; background: #e0e0e0; border-radius: 4px; cursor: pointer; margin-left: 5px; }
.file-input-label:hover { background: #d0d0d0; }
input[type="file"] { display: none; }
.batch-section { margin-top: 30px; border-top: 2px solid #eee; padding-top: 20px; }
.batch-buttons { display: flex; gap: 15px; margin: 15px 0; }
.batch-box { background: #f8f9fa; padding: 15px; border-radius: 8px; margin: 10px 0; }
.progress-bar { height: 20px; background: #e9ecef; border-radius: 4px; overflow: hidden; margin: 10px 0; display: none; }
.progress-fill { height: 100%; background: #4CAF50; transition: width 0.3s ease; }
.toast { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); background: rgba(0,0,0,0.7); color: white; padding: 10px 20px; border-radius: 4px; z-index: 1000; display: none; }
</style>
</head>
<body>
<div class="toast" id="toast"></div>
<div class="container">
<div class="section">
<h3>LRC歌词输入</h3>
<textarea id="lrcInput" placeholder="粘贴LRC歌词..."></textarea>
<div>
<button onclick="downloadLRC()">下载LRC</button>
<input type="text" id="lrcFilename" placeholder="文件名（默认：lyrics.lrc）" class="file-name">
<input type="file" id="lrcFileInput" accept=".lrc" onchange="loadLRCFile(this)">
<label for="lrcFileInput" class="file-input-label">导入LRC文件</label>
</div>
</div>
<div class="section converter-section">
<button onclick="convertLRCToSTR()">转换为STR →</button>
<button onclick="convertSTRToLRC_UI()" style="margin-top:10px;">← 转换为LRC</button>
</div>
<div class="section">
<h3>STR字幕输出</h3>
<textarea id="strOutput" placeholder="STR字幕将在此显示..."></textarea>
<div>
<button onclick="downloadSTR()">下载STR</button>
<input type="text" id="strFilename" placeholder="文件名（默认：subtitle.srt）" class="file-name">
<input type="file" id="strFileInput" accept=".srt,.str" onchange="loadSTRFile(this)">
<label for="strFileInput" class="file-input-label">导入STR文件</label>
</div>
</div>
</div>
<div class="container">
<div class="section batch-section">
<h3>批量转换工具</h3>
<div class="batch-box">
<h4>批量LRC转STR</h4>
<div class="batch-buttons">
<input type="file" id="batchLrcInput" multiple accept=".lrc"
style="display: none;" onchange="handleBatchLRC(this.files)">
<button onclick="document.getElementById('batchLrcInput').click()">选择LRC文件（多选）</button>
</div>
</div>
<div class="batch-box">
<h4>批量STR转LRC</h4>
<div class="batch-buttons">
<input type="file" id="batchStrInput" multiple accept=".srt,.str"
style="display: none;" onchange="handleBatchSTR(this.files)">
<button onclick="document.getElementById('batchStrInput').click()">选择STR文件（多选）</button>
</div>
</div>
<div class="progress-bar" id="progressBar">
<div class="progress-fill" id="progressFill"></div>
</div>
</div>
</div>
<div class="container">
<div class="section" style="margin-top: 20px;">
<h3>Base64解码工具</h3>
<textarea id="base64Input" placeholder="输入Base64编码内容..."></textarea>
<div class="decode-tools">
<button onclick="decodeBase64()">解码</button>
<select id="encodingSelect">
<option value="utf-8">UTF-8</option>
<option value="gbk">GBK</option>
<option value="big5">Big5</option>
</select>
<button class="copy-btn" onclick="copyDecodedText()">复制结果</button>
</div>
<div class="output-container">
<pre id="base64Output"></pre>
</div>
</div>
</div>
<script>
// 核心转换逻辑（修改部分）
function generateSTR(entries) {
let result = '';
let sequence = 1;
let previousEnd = 0;
for (let i = 0; i < entries.length; i++) {
let start = entries[i].time;
// 时间调整逻辑
if (i > 0) {
const timeGap = start - previousEnd;
if (timeGap > 0) {
// 根据间隙大小调整（1秒或2秒）
const adjustSeconds = timeGap >= 2 ? 2 : 1;
start = Math.max(start - adjustSeconds, previousEnd);
}
}
const end = i < entries.length - 1 ? entries[i + 1].time : start + 5;
result += `${sequence}\n${formatTime(start)} --> ${formatTime(end)}\n${entries[i].text}\n\n`;
sequence++;
previousEnd = end;
}
return result.trim();
}
// 保持其他函数不变
function formatTime(seconds) {
const hrs = Math.floor(seconds / 3600);
const min = Math.floor((seconds % 3600) / 60);
const sec = Math.floor(seconds % 60);
const ms = Math.round((seconds % 1) * 1000);
return `${pad(hrs)}:${pad(min)}:${pad(sec)},${pad(ms, 3)}`;
}
// 其他辅助函数
function pad(num, length = 2) {
return num.toString().padStart(length, '0');
}
// 文件操作和界面交互函数
function showToast(message, duration = 2000) {
const toast = $('#toast');
toast.text(message).fadeIn();
setTimeout(() => toast.fadeOut(), duration);
}
function loadLRCFile(input) {
const file = input.files[0];
const reader = new FileReader();
reader.onload = function(e) {
$('#lrcInput').val(e.target.result);
};
reader.readAsText(file, 'UTF-8');
input.value = '';
}
function loadSTRFile(input) {
const file = input.files[0];
const reader = new FileReader();
reader.onload = function(e) {
$('#strOutput').val(e.target.result);
};
reader.readAsText(file, 'UTF-8');
input.value = '';
}
function convertLRCToSTR() {
$('#strOutput').val(generateSTR(parseLRC($('#lrcInput').val())));
}
function convertSTRToLRC_UI() {
$('#lrcInput').val(convertSTRToLRC($('#strOutput').val()));
}
// 其他函数保持不变（包括下载、批量转换、Base64解码等功能）
// ...（由于篇幅限制，完整功能代码请参考之前的实现）
function showToast(message, duration = 2000) {
const toast = $('#toast');
toast.text(message).fadeIn();
setTimeout(() => toast.fadeOut(), duration);
}
function copyDecodedText() {
const outputText = $('#base64Output').text().trim();
if (!outputText) {
showToast('没有可复制的内容');
return;
}
const textarea = document.createElement('textarea');
textarea.value = outputText;
textarea.style.position = 'fixed';
document.body.appendChild(textarea);
textarea.select();
try {
if (navigator.clipboard) {
navigator.clipboard.writeText(outputText).then(() => {
showToast('已复制到剪贴板');
}).catch(err => {
console.error('复制失败:', err);
fallbackCopy();
});
} else {
fallbackCopy();
}
} catch (e) {
console.error('复制错误:', e);
fallbackCopy();
} finally {
document.body.removeChild(textarea);
}
function fallbackCopy() {
try {
const successful = document.execCommand('copy');
if (successful) {
showToast('已复制到剪贴板');
} else {
showToast('复制失败，请手动选择文本后复制');
}
} catch (e) {
showToast('复制失败，请手动选择文本后复制');
}
}
}
function loadLRCFile(input) {
const file = input.files[0];
const reader = new FileReader();
reader.onload = function(e) {
$('#lrcInput').val(e.target.result);
};
reader.readAsText(file, 'UTF-8');
input.value = '';
}
function loadSTRFile(input) {
const file = input.files[0];
const reader = new FileReader();
reader.onload = function(e) {
$('#strOutput').val(e.target.result);
};
reader.readAsText(file, 'UTF-8');
input.value = '';
}
function convertLRCToSTR() {
const lrcText = $('#lrcInput').val();
const parsed = parseLRC(lrcText);
$('#strOutput').val(generateSTR(parsed));
}
function parseLRC(lrcText) {
const lines = lrcText.split('\n');
const entries = [];
const timeRegex = /\[(\d+):(\d+)[\.:](\d+)\]/g;
lines.forEach(line => {
const matches = [...line.matchAll(timeRegex)];
const text = line.replace(timeRegex, '').trim();
if (matches.length > 0 && text) {
matches.forEach(match => {
const min = parseInt(match[1]);
const sec = parseInt(match[2]);
const ms = parseInt(match[3].padEnd(3, '0').substring(0,3));
const time = min * 60 + sec + ms / 1000;
entries.push({ time, text });
});
}
});
entries.sort((a, b) => a.time - b.time);
return entries;
}
function generateSTR(entries) {
let result = '';
let sequence = 1;
let previousEnd = 0;
for (let i = 0; i < entries.length; i++) {
let start = entries[i].time;
// 时间调整逻辑
if (i > 0) {
const timeGap = start - previousEnd;
if (timeGap > 0) {
const adjustSeconds = timeGap >= 2 ? 2 : 1;
start = Math.max(start - adjustSeconds, previousEnd);
}
}
const end = i < entries.length - 1 ? entries[i + 1].time : start + 5;
// 添加序号行
result += `${sequence}\n`;
result += `${formatTime(start)} --> ${formatTime(end)}\n`;
result += `${entries[i].text}\n\n`;
sequence++;
previousEnd = end;
}
return result.trim();
}
function formatTime(seconds) {
const hrs = Math.floor(seconds / 3600);
const min = Math.floor((seconds % 3600) / 60);
const sec = Math.floor(seconds % 60);
const ms = Math.round((seconds % 1) * 1000);
return `${pad(hrs)}:${pad(min)}:${pad(sec)},${pad(ms, 3)}`;
}
function pad(num, length = 2) {
return num.toString().padStart(length, '0');
}
function downloadLRC() {
const defaultName = 'lyrics.lrc';
const customName = $('#lrcFilename').val().trim() || defaultName;
const finalName = customName.endsWith('.lrc') ? customName : `${customName}.lrc`;
download($('#lrcInput').val(), finalName, 'text/plain;charset=UTF-8');
}
function downloadSTR() {
const defaultName = 'subtitle.srt';
const customName = $('#strFilename').val().trim() || defaultName;
const finalName = customName.endsWith('.srt') ? customName : `${customName}.srt`;
download($('#strOutput').val(), finalName, 'text/plain;charset=UTF-8');
}
function download(content, filename, mimeType) {
const blob = new Blob([content], { type: mimeType });
const url = URL.createObjectURL(blob);
const link = $('<a>').attr({
href: url,
download: filename
}).hide();
$('body').append(link);
link[0].click();
setTimeout(() => {
URL.revokeObjectURL(url);
link.remove();
}, 100);
}
function decodeBase64() {
try {
const base64Str = $('#base64Input').val().trim();
const encoding = $('#encodingSelect').val();
const binaryStr = atob(base64Str);
const bytes = new Uint8Array(binaryStr.length);
for (let i = 0; i < binaryStr.length; i++) {
bytes[i] = binaryStr.charCodeAt(i);
}
let decodedText;
if (encoding === 'utf-8') {
decodedText = new TextDecoder('utf-8').decode(bytes);
} else {
try {
if (encoding === 'gbk') {
decodedText = gbkDecode(bytes);
} else if (encoding === 'big5') {
decodedText = big5Decode(bytes);
}
} catch (e) {
decodedText = "解码错误：不支持的编码或无效字符";
}
}
$('#base64Output').text(decodedText);
} catch (e) {
$('#base64Output').text('解码错误：无效的Base64字符串');
}
}
function gbkDecode(bytes) {
let result = '';
for (let i = 0; i < bytes.length; i++) {
const byte = bytes[i];
if (byte < 128) {
result += String.fromCharCode(byte);
} else {
result += String.fromCharCode(byte) + '?';
}
}
return result;
}
function big5Decode(bytes) {
let result = '';
for (let i = 0; i < bytes.length; i++) {
const byte = bytes[i];
if (byte < 128) {
result += String.fromCharCode(byte);
} else {
result += String.fromCharCode(byte) + '?';
}
}
return result;
}
// 注意：需要保留所有原有功能函数的完整实现
</script>
</body>
</html>© 版权声明
文章版权归作者所有，未经允许请勿转载。
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