弹出另存为对话框时如何单击保存

var fileContent = "这是要保存的文件内容";
var fileName = "example.txt";

var blob = new Blob([fileContent], {type: "text/plain"});

if (window.saveAs) {
  window.saveAs(blob, fileName);
} else if (navigator.msSaveBlob) {
  navigator.msSaveBlob(blob, fileName);
} else {
  var downloadLink = document.createElement("a");
  downloadLink.href = URL.createObjectURL(blob);
  downloadLink.download = fileName;
  downloadLink.click();
}