RxJS：Multicasting运算符share

它是multicast()运算符的别名，唯一的区别是您不必手动调用connect()方法即可启动订阅。

语法

share()

例

import { interval} from 'rxjs';
import { take, share} from 'rxjs/operators';

let observer = interval(1000).pipe(take(3), share());
const subscribe_one = observer.subscribe(
   x => console.log("Value from Sub1 = "+x)
);
const subscribe_two = observer.subscribe(
   x => console.log("Value from Sub2 = "+x)
);
setTimeout(() => {
   const subscribe_three = observer.subscribe(
      x => console.log("Value from Sub3 = "+x)
   );
}, 2000);

输出