如何在 Firebase Cloud Function 条件下使用模板文字

Question

是否可以在 Firebase Cloud Function 的消息条件中使用模板文字？

我尝试了以下方法，但它不起作用。

topic1 = `${myObject.id}`
topic2 = `${myObject.name}`
var condition = "topic1 in topics || topic2 in topics";

var message = {
  notification: {
    title: 'My object',
    body: 'My object.'
  },
  condition: condition
};

admin.messaging().send(message);

我改成这个还是不行：

      topic = "_full";
      topic1 = `${myObj.field1}` + topic;
      topic2 = (`${myObj.field2.field1}_${myObj.field2.field2}` + topic)
        .toString()
        .toLowerCase()
        .split(" ")
        .join("_");
      topic3 = `${myObj.field3.field1}` + topic;
      topic4 = `${myObj.field4.field1}` + topic;

      condition = `${topic1} in topics || ${topic2} in topics || ${topic3} in topics || ${topic4} in topics`;

我收到“错误：提供的条件表达式无效。”

Answer 1

因为你有"topic1 in topics || topic2 in topics"，它是一个普通的字符串，其中的变量不会被扩展。 topic1 也不是变量，应该是 ${topic1}。

您可以：

var condition = `${myObject.id} in topics || ${myObject.name} in topics`;

或者：

topic1 = `${myObject.id}`
topic2 = `${myObject.name}`
var condition = `${topic1} in topics || ${topic2} in topics`;

Answer 2

不要忘记在主题周围添加单引号：

var condition = `'${topic1}' in topics || '${topic2}' in topics`;