javascript - 使用 co? 设置每次解析之间的睡眠间隔？

Question

我co用来执行带有一堆http请求的生成器：

co(function *(){
  // resolve multiple promises in parallel 
  var a = httpRequest(...);
  var b = httpRequest(...);
  var c = httpRequest(...);
  var res = yield [a, b, c];
  console.log(res);
}).catch(onerror);

有没有办法让我在每个 http 请求之间引入一秒钟的睡眠？谢谢。

Answer 1

是的你可以。每个产量 - 用 dilay 返回新的承诺（在承诺中 - 你必须根据 httpRequest 回调触发解析或拒绝）
以这种方式尝试

co(function *(){
var a = yield new Promise(function(resolve, reject){
    setTimeout(function () {
        //rosolve or reject this promise in callback of httpRequest();
    }, 1000)
});
var b = yield new Promise(function(resolve, reject){
    setTimeout(function () {
        //rosolve or reject this promise in callback of httpRequest();
    }, 1000)
});
var c = yield new Promise(function(resolve, reject){
    setTimeout(function () {
        //rosolve or reject this promise in callback of httpRequest();
    }, 1000)
});
var res = [a, b, c];
    console.log(res); 
}).catch(onerror);