英文:
Waiting for response from the server to continue the program
问题
对于我的生物信息学工作，我想要构建一个与Node.js服务器（Express）连接的React应用程序。
想法是客户端选择他们需要分析的样本，然后服务器会处理工作流程。我希望程序在每个样本上执行第一个过程，然后在每个样本上执行第二个过程。
在运行后续过程之前等待过程结束（并从服务器获得积极响应）非常重要。我认为嵌套循环会起作用，但不是这样。
processes.forEach(p => {
samples.forEach(s => {
runProcess()
})
})
我尝试了async/await方法，但没有成功。
英文:
For my bioinformatics work, I want to build a React app, connected to Node.js server (Express).
The idea is that the client picks the samples they need to analyse, and the server would process the workflow. I want the program to execute process one on each sample, after that process two on each sample.
It's very import to wait for the process to end (and get a positive response from the server) before running the following process. I thought a nested loop would work, but no.
processes.forEach(p => {
samples.forEach(s => {
runProcess()
})
})
I tried the async/await method, but without success.
答案1
得分: 1
forEach 不支持异步，而 for 循环可以支持异步调用。你可以尝试像这样写：
const wait = (time) => new Promise(resolve => {
setTimeout(resolve, time)
});
async function runCode() {
const arr = [1,2,3,4]
for (let i = 0; i < arr.length; i++) {
// 开始你的请求
await wait(3000)
// 请求完成后，下一个请求将开始
console.log('item', i);
}
}
runCode()
英文:
forEach does not support asynchronous, for loop can support asynchronous calls. you can try like this.
const wait = (time) => new Promise(resolve => {
setTimeout(resolve, time)
});
async function runCode() {
const arr = [1,2,3,4]
for (let i = 0; i < arr.length; i++) {
// start your request
await wait(3000)
// request finished then next will start
console.log('item', i);
}
}
runCode()
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论