ES6--Generator

{
    //generator
    let tell=function* (){
        yield 'a';
        yield 'b';
        return 'c';
    }
    let k=tell();
    console.log(k.next());
    console.log(k.next());
    console.log(k.next());
    console.log(k.next());
}
{
   let obj={};
   obj[Symbol.iterator]=function* (){
       yield 1;
       yield 2;
       yield 3;
   }
   for(let value of obj){
       console.log(value);
   }
}
{
    let state=function* (){
        while (1){
            yield "A";
            yield "B";
            yield "C";
        }
    }
    let status=state();
    console.log(status.next())
    console.log(status.next())
    console.log(status.next())
    console.log(status.next())
    console.log(status.next())
    console.log(status.next())
}