how to connect data in tradingview? who did this? please answer me. In documentation says if i have websoket i need api js method, so how did this? [требует правки]

TradingView.onready(function()
{
    var widget = window.tvWidget = new TradingView.widget({
        // debug: true, // uncomment this line to see Library errors and warnings in the console
        fullscreen: true,
        symbol: 'BTC-USD',
        interval: 'D',
        container_id: "tv_chart_container",
        //  BEWARE: no trailing slash is expected in feed URL
        // datafeed: new Datafeeds.UDFCompatibleDatafeed("https://demo_feed.tradingview.com"),
        library_path: "chart/charting_library/",
        locale: getParameterByName('lang') || "en",
        //  Regression Trend-related functionality is not implemented yet, so it's hidden for a while
        drawings_access: { type: 'black', tools: [ { name: "Regression Trend" } ] },
        disabled_features: ["use_localstorage_for_settings"],
        enabled_features: ["study_templates"],
        charts_storage_url: 'http://saveload.tradingview.com',
        charts_storage_api_version: "1.1",
        client_id: 'tradingview.com',
        user_id: 'public_user_id'
    });
});