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interface inter_fileConfig {
    databaseName:string;
    username:string;
    password:string;
    host:string;
    port:string;
    [key:string]:any;
}

class FileConfig {
    static config:FileConfig = new FileConfig();
    private baseConfig:inter_fileConfig;

    // 不能通过new初始化数据
    private constructor() {
        this.baseConfig = this.initConfig()
    }

    private initConfig() {
        return {
            databaseName:"sales",
            username:"username",
            password:"pwd",
            host:"192.1.1.1",
            port:"8888"
        }
    }

    // 读取配置
    public getConfig(_key:string):string {
        console.log(this.baseConfig[_key])
        return this.baseConfig[_key]
    }

    // 更改配置
    public setConfig(_key:string, _value:string) {
        this.baseConfig[_key] = _value
    }

    // 重置配置
    public resetConfig() {
        this.baseConfig = this.initConfig()
    }
}