class HTTP {

    constructor() {
        this.xhr = new XMLHttpRequest();
    }

    get(option) {
        return new Promise((success, error) => {
            var GetParams = ""
            for (const key in option.data) {
                GetParams += `&${key}=${option.data[key]}`
            }
            GetParams = GetParams.replace("&", "?")
            option.url += GetParams;

            this.xhr.open("GET", config.checkUrl() + option.url)
            this.xhr.send()
            this.onreadystatechange(success, error)
        })
    }

    post(option) {
        return new Promise((success, error) => {
            this.xhr.open("POST", config.checkUrl() + option.url)
            this.xhr.setRequestHeader("Content-Type","application/json; charset = UTF-8");
            this.xhr.send(JSON.stringify(option.data))
            this.onreadystatechange(success, error)
        })
    }

    onreadystatechange(success, error) {
        this.xhr.onreadystatechange = () => {
            if (this.xhr.readyState == 4) {
                if (this.xhr.status == 200) {
                    var data = JSON.parse(this.xhr.responseText)
                    switch (data.status) {
                        case 200:
                            return success(data.result || data.data)
                        break;

                        case 404:
                            alert(data.msg);
                            throw new Error(data.msg);
                            break;
                    }
                } else {
                    console.log("暂无数据");
                    error(this.xhr)
                }

            }
        }
    }


}