第 2 期(2019-05-09)：定时输出数字 about fe-practice-hard HOT 5 OPEN

const printNumber = number => {
    console.log(number--);
    number && setTimeout(() => printNumber(number), 1000);
};
printNumber(5);

// 利用了 let
const printNumber = () => {
    for (let i = 5; i > 0; i--) {
        setTimeout(() => {
            console.log(i)
        }, (6 - i) * 1000)
    }
}

// 利用了闭包
const printNumber = () => {
    for (var i = 5; i > 0; i--) {
        (function (i) {
            setTimeout(() => {
                console.log(i)
            }, (6 - i) * 1000)
        })(i)
    }
}

// 利用了闭包
const printNumber = () => {
    for (var i = 5; i > 0; i--) {
        setTimeout(((i) => {
            return () => {
                console.log(i);
            }
        })(i), (6 - i) * 1000);
    }
}

const outputNumber = () => {
  const max = 5;
  let i = max;
  while (i) {
    setTimeout(i => {
      console.log(max + 1 - i);
    },1000 * i, i--);
  }
};

//setTimeout循环和条件停止循环
//参考网址：https://blog.csdn.net/qq_28256783/article/details/80097092
var a=6;
function printN(){
   if(a>1){
     a=a-1;
     console.log(a);
     setTimeout("printN()",1000)
   }
}
printN();