es6 之 generator(-)

function sayName(){
            console.log(1);
            console.log(2);
        }
        sayName();
        
        function *geneSayName(){
            console.log(1);
            yield;
            console.log(2);
        }
        geneSayName();

let gene=geneSayName();
        gene.next();
        gene.next();