1）数组Arrays
console.log([][Symbol.iterator])
for(let x of ['a','b'])
console.log(x)
2）字符串Strings
console.log(""[Symbol.iterator])
for(let x of "abc")
console.log(x)
3）Map
let map = new Map().set('a', 1).set('b', 2);
console.log(map[Symbol.iterator]);
for (let pair of map) {
console.log(pair);
}
4）Set
let set = new Set().add('a').add('b');
for (let x of set) {
console.log(x);
}
5）arguments
function printArgs() {
for (let x of arguments) {
console.log(x);
}
}
printArgs('a', 'b');
6）Typed Arrays
7）Generators，ES6新增加
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