Rx.Observable.generateWithRelativeTime(initialState, condition, iterate, resultSelector, timeSelector, [scheduler])

生成一个带相对时间控制的Observable,通过迭代一个初始值，直到判定条件返回false.Generates an observable sequence by iterating a state from an initial state until the condition fails.

参数

1. initialState (Any): 初始值.
2. condition (Function): 生成判定条件的函数（返回false时终止循环）
3. iterate (Function): 迭代函数
4. resultSelector (Function): 处理迭代函数的值，返回最终结果
5. timeSelector (Function): 间隔时间函数来控制每次迭代产生的值的速度，返回指示毫秒的整数值（相对当前的时间差值）
6. [scheduler=Rx.Scheduler.timeout] (Scheduler): generator循环的调度器，如果没有提供，默认为 Scheduler.timeout.

返回值

(Observable): Observable

例

// Generate a value with an absolute time with an offset of 100ms multipled by value
var source = Rx.Observable.generateWithRelativeTime(
    1,
    function (x) { return x < 4; },
    function (x) { return x + 1; },
    function (x) { return x; },
    function (x) { return 100 * x; }
).timeInterval();

var subscription = source.subscribe(
    function (x) {
        console.log('Next:', x);
    },
    function (err) {
        console.log('Error: ' + err);   
    },
    function () {
        console.log('Completed');   
    });

// => Next: {value: 1, interval: 100}
// => Next: {value: 2, interval: 200}
// => Next: {value: 3, interval: 300}
// => Completed