RxJS - 多播運算子 share

它是一個 multicast() 運算子別名，唯一的區別是您不必手動呼叫 connect () 方法來啟動訂閱。

語法

share()

示例

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);

輸出