javascript - 如何从公共(public) API 获取 JSON 响应到 JSON 对象？

Question

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Answer 1

您的readyState 永远不会被检查是否complete:

Http.onreadystatechange = e => {
    if (this.readyState == "complete") {
        jsonData = Http.response;
        jsonActual = JSON.parse(jsonData.toString());
    }
}

您还可以检查 4:

Http.onreadystatechange = e => {
    if (this.readyState == 4) {
        jsonData = Http.response;
        jsonActual = JSON.parse(jsonData.toString());
    }
}

你可以让它变得更简单，使用fetch:

let jsonData;
let jsonActual;
function GetWeather(city, country){
    fetch(`${weatherUrl}${city},${country}${weatherKey}`).then(res => res.json()).then(res => {
        jsonData = res;
        jsonActual = JSON.parse(res);
    });
}