POST-CORS-QueryParamsinBody.md

postData = (url = '', data = {}, fetchmethod = 'POST', fetchmode) => {
        const esc = encodeURIComponent;
        var query = Object.keys(data)
                    .map(k => esc(k)+ '=' + esc(data[k]))
                    .join('&');
        return fetch(url, {
            method: fetchmethod, // *GET, POST, PUT, DELETE, etc.
            mode: fetchmode, // no-cors, cors, *same-origin
            cache: "no-cache", // *default, no-cache, reload, force-cache, only-if-cached
            credentials: "same-origin", // include, same-origin, *omit
            headers: {
                "Content-Type": "application/x-www-form-urlencoded",
            },
            body: query
        })
    }