限制并发数

 来源：

import axios from 'axios'

export const handQueue = (
    list // 请求总数
) => {
    list = list || 0

    const requestQueue = (maxNum = 6) => {
        const queue = [];
        let current = 0 // 当前请求了多少条

        const dequeue = () => {
            while (current < maxNum && queue.length) {
                current++
                const currentPromise = queue.shift() // 出列
                currentPromise()
                    .then(() => {
                        // 成功的请求逻辑
                        console.log('执行成功')
                    })
                    .catch((error) => {
                        // 失败
                        console.log(error)
                    })
                    .finally(() => {
                        current--
                        dequeue()
                    })
            }
        }

        return (currentPromise) => {
            queue.push(currentPromise) // 入队
            dequeue()
        }
    }

    const enqueue = requestQueue(6)

    for (let i = 0; i < list; i++) {
        enqueue(() => axios.get('/api/test' + i))
    }
}