该函数接收一个 array 作为输入参数，遍历这个 array，将其每个元素，作为另一个匿名函数执行的一部分。该匿名函数体内，将 array 的元素作为 subscriber 订阅函数的输入：
<html>
<script>
const subscribeToArray = (array) => (subscriber) => {
for (let i = 0, len = array.length; i < len && !subscriber.closed; i++) {
subscriber.next(array[i]);
}
subscriber.complete();
};
const aInput = [1,2,3,4];
const newFunction = subscribeToArray(aInput);
debugger;
</script>
</html>
<html>
<script>
const subscribeToArray = (array) => (subscriber) => {
for (let i = 0, len = array.length; i < len && !subscriber.closed; i++) {
subscriber.next(array[i]);
}
subscriber.complete();
};
const aInput = [1,2,3,4];
const newFunction = subscribeToArray(aInput);
const subscriber = {
closed: false
};
subscriber.next = (data) => console.log("next: " + data);
subscriber.complete = () => console.log("completed!");
debugger;
newFunction(subscriber);
</script>
</html>
直到应用程序代码调用 Observable 的 subscribe 方法时，才会变量 input 数组，用 subscribe 的 next 方法依次处理 input 数组的元素。在 CombineLatest Operator 的例子里，input 元素就是 Observable 对象的组合。