const PubSub = (function () {
    const publishList = [];
    return {
　　　　　// TS增加interface限制傳入資訊
        publish: function (msg) {
            publishList.push(msg);
        },
        subscribe: function () {
            for (let i = 0; i < publishList.length; i++) {
                let { fun, perload } = publishList[i];
                fun();
                if (perload !== 'always' && --perload <= 0) {
                    publishList.splice(i, 1);
                    i--;
                }
            }
        }
    }
})();
PubSub.publish({
    fun: () => {
        console.log('1:   一次訂閱 只執行一次');
    },
    perload: 1
});
PubSub.publish({
    fun: () => {
        console.log('無限訂閱 執行多次');
    },
    perload: 'always'
});
PubSub.publish({
    fun: () => {
        console.log('2:   一次訂閱 只執行一次');
    },
    perload: 1
});
PubSub.subscribe();
console.log('第二次釋出===============>');
PubSub.subscribe();
console.log('第三次釋出===============>');
PubSub.subscribe();