请求api

function fetchGet (url, callback) {
    fetch(url).then((response) => {
        if (response.headers.get("content-type")?.indexOf("application/json") > -1) {
            return response.json();
        } else {
            return response.text();
        }
    }).then((response) => {
        callback(response);
    });
}

async function fetchSyncPost (url, data) {
    const init = {
        method: "POST",
    };
    if (data) {
        if (data instanceof FormData) {
            init.body = data;
        } else {
            init.body = JSON.stringify(data);
        }
    }
    const res = await fetch(url, init);
    const res2 = await res.json();
    return res2;
}