用于下载由Python3 Flask生成的ZipFile的Javascript按钮

<button id="downloadBtn">下载Zip文件</button>

document.getElementById("downloadBtn").addEventListener("click", function() {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", "/download-zip", true); // 向后端发送GET请求，获取Zip文件
  xhr.responseType = "blob"; // 设置响应类型为二进制数据

  xhr.onload = function() {
    if (xhr.status === 200) {
      var blob = new Blob([xhr.response], { type: "application/zip" }); // 创建Blob对象
      var url = URL.createObjectURL(blob); // 创建临时URL

      var a = document.createElement("a");
      a.href = url;
      a.download = "file.zip"; // 设置下载文件的名称
      a.click(); // 模拟点击下载链接
      URL.revokeObjectURL(url); // 释放临时URL资源
    }
  };

  xhr.send();
});

from flask import Flask, send_file

app = Flask(__name__)

@app.route("/download-zip")
def download_zip():
    # 生成Zip文件的代码逻辑
    # ...

    # 假设生成的Zip文件保存为"file.zip"
    return send_file("file.zip", as_attachment=True)

if __name__ == "__main__":
    app.run()