SOURCE

function copyText() {
    const textInput = document.getElementById('textInput');
    const originalText = textInput.value;
    const TextArr = originalText.split("*");
    const appendedText = arrTostring(TextArr);
   // const appendedText = `ffmpeg -i .\\${originalText}.avi -c:v h264_nvenc -preset slow -cq 38 -filter:v fps=fps=5 -b:a 22k ${originalText}_转.mp4 & `;
    //originalText + ' 追加的字符'; // 在这里追加你需要的字符
    navigator.clipboard.writeText(appendedText)
        .then(() => {
            console.log('文本已成功复制到剪贴板！');
        })
        .catch(err => {
            console.error('无法复制文本: ', err);
        });
}

function arrTostring(TextArr) {
    let temp = []
    TextArr.forEach(element => {
        temp.push(`ffmpeg -i .\\${element}.wmv -c:v h264_nvenc -preset slow -cq 38 -filter:v fps=fps=5 -c:a aac ${element}_转.mp4`);
    });
    return temp.join(" & ");
}

<div class="container">
    <input type="text" id="textInput" placeholder="请输入要复制的文本">
    <button onclick="copyText()">复制文本</button>
</div>

 body {
     font-family: Arial, sans-serif;
     display: flex;
     justify-content: center;
     align-items: center;
     height: 100vh;
     background-color: #f4f4f9;
 }
 
 .container {
     text-align: center;
     background-color: white;
     padding: 20px;
     border-radius: 8px;
     box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
 }
 
 input[type="text"] {
     width: 80%;
     padding: 10px;
     margin-bottom: 10px;
     border: 1px solid #ccc;
     border-radius: 4px;
 }
 
 button {
     padding: 10px 20px;
     background-color: #007bff;
     color: white;
     border: none;
     border-radius: 4px;
     cursor: pointer;
 }
 
 button:hover {
     background-color: #0056b3;
 }