Question

以下代码会引发tsc错误，但不确定如何纠正错误。

将rxjs 5.0.3与tsc 2.1.5一起使用

import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';
import 'rxjs/Rx';

let subject = new Subject();

Observable.merge(subject, Observable.interval(500))
  .startWith(new Date())
  .scan((acc, curr) => {
    const date = new Date(acc.getTime());
    date.setSeconds(date.getSeconds() + 1);
    return date;
  })
  .subscribe(v => {
    let today = v.toISOString();
    console.log(today);
  });

我看到的错误是：

node_modules/rxjs/Observable.d.ts(68,60): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/Observable.d.ts(68,70): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/observable/PromiseObservable.d.ts(40,31): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/observable/PromiseObservable.d.ts(41,26): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/operator/toPromise.d.ts(2,60): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/operator/toPromise.d.ts(3,79): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/operator/toPromise.d.ts(3,89): error TS2304: Cannot find name 'Promise'.
test.ts(10,31): error TS2339: Property 'getTime' does not exist on type 'number | {}'.
  Property 'getTime' does not exist on type 'number'.
test.ts(15,19): error TS2339: Property 'toISOString' does not exist on type 'number | {}'.
  Property 'toISOString' does not exist on type 'number'.

Answer 1

看起来非常简单，就像你试图打电话一样＃34;日期＆＃34;普通旧数字的方法。＆＃34; ACC＆＃34;这里不会将其解释为日期（或者它已经转换为数字，并且您继续尝试将其视为日期）。

如果我不得不猜测，我会说改变：

const date = new Date(acc.getTime());

到

const date = new Date(acc).getTime();

可能会遇到那个障碍。或者，因为您要返回＆＃34; date＆＃34;：

const date = new Date(acc);
date.setSeconds(date.getSeconds() + 1);
return date.getTime ( );

最后：

let today = new Date ( v ).toISOString();
console.log(today);

注意＆＃34;扫描＆＃34;的文档（此外，使用＆＃34;种子＆＃34;而不是＆＃34; startWith＆＃34;可能很有趣）：

acc: Any - the accumulated value. 
currentValue: Any - the current value 
index: Number - the current index 
source: Observable - the current observable instance 
[seed] (Any): The initial accumulator value.

Answer 2

要更正类型错误，请执行以下操作。

acc

对于其他错误，我将curr和any的类型设置为import { Observable } from 'rxjs/Observable'; import { Subject } from 'rxjs/Subject'; import 'rxjs/Rx'; let subject = new Subject(); Observable.merge(subject, Observable.interval(500)) .startWith(new Date()) .scan((acc: any, curr: any) => { const date = new Date(acc.getTime()); date.setSeconds(date.getSeconds() + 1); return date; }) .subscribe(v => { let today = v.toISOString(); console.log(today); });。修正后的代码在这里编译并运行正常。

class="mid"

带有TypeScript的Rxjs编译错误

2 个答案: