![[求助] python 如何爬取 网页上调用JS函数打开的视频链接](/aiimages/%5B%E6%B1%82%E5%8A%A9%5D+python+%E5%A6%82%E4%BD%95%E7%88%AC%E5%8F%96+%E7%BD%91%E9%A1%B5%E4%B8%8A%E8%B0%83%E7%94%A8JS%E5%87%BD%E6%95%B0%E6%89%93%E5%BC%80%E7%9A%84%E8%A7%86%E9%A2%91%E9%93%BE%E6%8E%A5.png)
看了你的问题，才百度学习的Promise，不知道是不是你要的效果。
function async1(){return new Promise(function(resolve, reject) {
setTimeout(function() {//setTimeout模拟异步
console.log('async1 is done')
resolve('async1 value')
}, 6000)
})
}
function async2(){
return new Promise(function(resolve, reject) {
setTimeout(function() {//setTimeout模拟异步
console.log('async2 is done')
resolve('async2 value')
}, 3000)
})
}
function async3(){//async3不需要then，所以没写return new Promise
setTimeout(function() {
console.log('async3 is done')
}, 1000)
}
let p
for(let i=0i<4i++){
p=async1().then(async2)
}
p.then(async3)
axios.post('/operationlog/list', moduleParams).then((res) =>{if (res.status === 200) { this.moduleList = res.data.itemsstepParams.append('category', "")
stepParams.append('needPlayback', true) for (let i = 0i <this.moduleList.lengthi++) {
stepParams.set('category', this.moduleList[i].category)
axios.post('/operationlogitem/list', stepParams).then((res) =>{ console.log(res.data.items)
}).catch((e) =>{ console.log(e)
})
}
}
}
代码如上,根据外层请求获取到多个不同的category,但是for循环是同步,里面的post请求是异步的,所以始终以最后一项的category为参数发送请求.请问如何修改代码按照每一项的category参数发送post请求
