用Babel 把es6代码转为es5时 然后generator函数在浏览器中报错怎么解决

Question

es6中代码 想打印一下报错function* add(){    yield "hello";    yield "world";    return "encoding";}let ad=add();console.log(ad.next())console.log(ad.next())console.log(ad.next());console.log(1)