the meaning of life

test

var life = {
    start: function() {
        delete this.stop;
    },
    stop: function() {
        console.log('arg...');
    }
};

// v2
var life = {
    start: function() {
        window.life = undefined;
    },
    stop: function() {
        console.log('damn !');
    }
}


life.start();
life.stop();