Google Maps API v3 travelMode作为变量

Question

我正在尝试将HTML表单中的值（值来自单选按钮输入）传递到我的google maps API脚本。我可以在console.log中找到travelMode并且它看起来正确并且应该正常工作，但我不断收到此错误：“未捕获的InvalidValueError：在属性travelMode：google.maps.TravelMode.DRIVING”。如果我取出变量并直接输入驱动模式，它就可以正常工作。

是什么给出的？这是我的代码，如果需要，我可以提供更多代码：

// Get the travel method
  if (document.getElementById('bicycle').checked) {
    var method = "google.maps.TravelMode.BICYCLING";
  } else if (document.getElementById('motorcycle').checked) {
    var method = "google.maps.TravelMode.DRIVING";
  } else {
    var method = "google.maps.TravelMode.DRIVING";
  };

  console.log(method);

  var request = {
      origin: start,
      destination: end,
      travelMode: method,
  };

Answer 1

尝试这种方式：

var method = 'DRIVING';

var request = {
    origin: start,
    destination: end,
    travelMode: google.maps.TravelMode[method]
};

Answer 2

删除引号

  if (document.getElementById('bicycle').checked) {
    var method = google.maps.TravelMode.BICYCLING;
  } else if (document.getElementById('motorcycle').checked) {
    var method = google.maps.TravelMode.DRIVING;
  } else {
    var method = google.maps.TravelMode.DRIVING;
  };