js流量控制

思路

核心思路是，通过在任务完成的时候通过回调触发新的循环引入任务。

代码

let logic = (num) =>{
    num = num * 1000;
    return new Promise((resolve)=>{
        setTimeout(() => {
            console.log(num);
            resolve(num);
        }, num);
    })
}

function f(){
    let jobList = [1,1,5,4,1,2,2];
    let workingNum = 0;
    let getJob = () =>{
        while(workingNum<2 && jobList.length>0){
            let newJobNum = jobList.shift();
            logic(newJobNum).then(ret=>{
                workingNum--;
                getJob();
            });
            workingNum++;
        }
    }
    getJob();
}
f()