使用co？

Question

我使用co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);

我有办法在每个http请求之间引入第二个睡眠吗？感谢。

Answer 1

是的，你可以。每次收益 - 用延迟返回新的承诺（承诺 - 你必须解决或拒绝根据httpRequest回调）
试试这种方式

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);