基本的javascript概念理解[duplicate]

var counterObject = {
    counter : 0,
    start : function() {

        const that = this;

        setInterval( function() {

            // This function has a different scope so `this` is not your `counterObject`
            // anymore. In order to use it you need to make a reference to it

            /*
            this.i++;
            console.log( this.i );
            this.start;
            */

            // i? You probably meant counter, btw
            that.counter++;
            console.log( that.counter );

            // Invoking a function always need parenthesis, so you should add those
            // to make the recursive call
            that.start();

        }, 1000 );
    }
};
counterObject.start();