rxjs里combineLatest operators的用法

Whenever any input Observable emits a value, it computes a formula using the latest values from all the inputs, then emits the output of that formula.

这个图的一些解释：

看个例子：

const firstTimer = timer(0, 1000); // emit 0, 1, 2... after every second, starting from now
const secondTimer = timer(500, 1000); // emit 0, 1, 2... after every second, starting 0,5s from now
const combinedTimers = combineLatest(firstTimer, secondTimer);
combinedTimers.subscribe(value => console.log('diablo: '
 + value));

测试结果：

时间轴分析：

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