globalThis

var getGlobal = function () {
    if (typeof self !== "undefined") {
        return self;
    }
    if (typeof window !== "undefined") {
        return window;
    }
    if (typeof global !== "undefined") {
        return global;
    }
    throw new Error("unable to locate global object");
};
var globals = getGlobal();
if (typeof globals.setTimeout !== "function") {
    // 此环境中没有 setTimeout 方法！
}

globalThis