JavaScript生成器-generator

1. 创建生成器

由function*定义的函数即是generator

  function* test(){
    yield 1;
    yield 2;
    yield 3;
    return 4;
 }

2. 生成器的使用

  var t = test();
  t.next();    //{value: 1, done: false}
  t.next();    //{value: 2, done: false}
  t.next();    //{value: 3, done: false}
  t.next();    //{value: 4, done: true}

  try {
      r1 = yield ajax(url1, data1);
      r2 = yield ajax(url2, data2);
      r3 = yield ajax(url3, data3);
      success(r3);
  }
  catch (err) {
      handle(err);
  }