的NodeJS：如何设法率请求的数量限制到服务器时使用的异步/ AWAIT

我试图使用地理编码API通过限制请求到每秒1次的数量来获得JSON对象。我需要使用异步/等待，这就是我

const requester = {
    lastRequest: new Date(),
    makeRequest: async (url) => {
        var timestart = new Date()
        // first check when last request was made
        var timeSinceLast = (timestart).getTime() - this.lastRequest.getTime();
        if (timeSinceLast < 1000) {
            await new Promise(resolve => setTimeout(resolve, timeSinceLast));
        }
        const response = await fetch(url);
        const json = await response.json();
        return json;
        // make request here and return result
    }
};
var requestResponse = requester.makeRequest('/?
     locate=Warsaw,Poland&json=1')

有了这个我收到以下错误：

UnhandledPromiseRejectionWarning：类型错误：无法读取的未定义的属性“的getTime”

UnhandledPromiseRejectionWarning：未处理的承诺拒绝。起源或者通过一个异步函数的内部抛没有catch块，或通过拒绝（），将其不与.catch处理一个承诺此错误。 （拒收ID：1）

我试图找到为什么发生这种情况，当只打印请求对象，我没有得到GETTIME（）未定义的错误。我使用异步/等待正确的承诺？我究竟做错了什么？

编辑：基于下面的答案，我再也看不到错误，但是我看到的要求经过调节“

const requester = {
   lastRequest: new Date(),
   makeRequest: async function(url){
       var timestart = new Date()
       // first check when last request was made
       var timeSinceLast = (timestart).getTime() - this.lastRequest.getTime();
       if (timeSinceLast < 1000) {
           await new Promise(resolve => setTimeout(resolve, timeSinceLast));
       }
       const response = await fetch(url);
       const json = await response.json();
       return json;
       // make request here and return result
   }
};
requester.makeRequest('/?locate=Warsaw,Poland&json=1') 
.then(console.log) 

这就是我现在看到的：

{ success: false,
 error: { code: '006', message: 'Request Throttled.' } }

我需要等待您的答复？

Arrow functions don't have this，所以this.lastrequest.getTime是undefined。

用一个普通函数：

const requester = {
    lastRequest: new Date(),
    makeRequest: async function(url){
        var timestart = new Date()
        // first check when last request was made
        var timeSinceLast = (timestart).getTime() - this.lastRequest.getTime();
        if (timeSinceLast < 1000) {
            await new Promise(resolve => setTimeout(resolve, timeSinceLast));
        }
        const response = await fetch(url);
        const json = await response.json();
        return json;
        // make request here and return result
    }
};
requester.makeRequest('https://geocode.xyz/?locate=Warsaw,Poland&json=1') //Don't write strings in two lines
.then(console.log)