SOURCE

document.getElementById("zipInput").addEventListener("change", handleFile);

function handleFile(event) {
  const file = event.target.files[0];
  const reader = new FileReader();

  reader.onload = function (e) {
    const base64String = e.target.result.split(",")[1]; // 获取 Base64 编码
    document.body.innerHTML =
      "Base64 编码:" + base64String.length + "TTTEST\n" + base64String;
    // for (let i = 0; i < base64String.length; i += 1000) {
    //   console.log(base64String.split(0, i));
    // }

    // 触发下载 ZIP
    // createZipFromBase64(base64String, file.name);
  };

  reader.readAsDataURL(file); // 以 Base64 方式读取文件
}

// function createZipFromBase64(base64String, fileNa  me) {
//     const zip = new JSZip();
//     zip.file(fileName, base64String, { base64: true });

//     zip.generateAsync({ type: "blob" }).then(function(content) {
//         const link = document.createElement("a");
//         link.href = URL.createObjectURL(content);
//         link.download = fileName;
//         link.click();
//     });
// }

// const base64=123

<input type="file" id="zipInput">
<button onclick="convertAndDownload()">转换</button>