class Ajax{
    constructor() {
        this.ajax = new XMLHttpRequest();
    }

    get(params){         //(success,error)
        return new Promise((resolve,reject) => {
            var str = ""
            for (const key in params.data) {
                str += `&${key}=${params.data[key]}`
            }

            str = str.replace("&", "?")
            this.ajax.open("GET", `${params.url}${str}`)
            this.ajax.send()
            this.readystatechange(resolve, reject)
        })
    }

    post() { }


    readystatechange(resolve, reject) {
        this.ajax.onreadystatechange = () => {
            if (this.ajax.readyState == 4) {
                if (this.ajax.status == 200) {
                    var data = JSON.parse(this.ajax.responseText)
                    // console.log(data);
                    resolve(data)
                } else {
                    reject(this.ajax)
                }
            }
        }
    }
}

var ajax = new Ajax();