如何使用for循环对数字进行计数? [英] How can I use for loop to count numbers?

问题描述

我需要向上计数数字，并用介于两者之间的字符串"then"将其打印出来:5然后6然后7然后...像这样.返回时，我对使用参数vs函数名感到非常困惑.我的代码在下面..但是有人可以帮忙吗?

I need to count numbers upward and have it print out with a string "then" in between: 5 then 6 then 7 then... like this. I am very confused with using the parameters vs function name when you return. My code is below.. but could someone help with this?

function countUp(start) {
  start +=    
  for(var i = start; i < start + 10; i++) {
    console.log(start[i] + "then");
  }
  return start;
}

推荐答案

我会做这样的事情:

function countSheep(limit){
    for (var i = 1; i < limit; i +=1){
        console.log(i + " sheep")
    }
}

countSheep(10);

我使用绵羊"代替然后"，但是您明白了.既然您只是想产生一个副作用(将"1然后2 .."打印到控制台，则无需构建一个字符串，然后让您的函数将其返回.

I used "sheep" instead of "then", but you get the idea. Since you just want to produce a side effect (print out a "1 then 2.." to the console, you don;t need to build up a string and then have your function return it.

如果您确实想构建一个字符串然后让函数返回它，则可以执行以下操作:

If you did want to build up a string and then have your function return it though, you could do something like this instead:

function countSheep(limit){

    var allMySheep = "";

    for (var i = 1; i < limit; i +=1){
        allMySheep += (i + " sheep, ") 
    }

    return allMySheep;
}

console.log(countSheep(10));

注意:我从1(变量i = 1)开始循环，因为我是在计数绵羊，而不是数字.您可能想从0(var i = 0)开始.

Note: I started my loops at 1 (var i = 1) because I'm counting sheep, not numbers. You'd probably want to start yours at 0 (var i = 0).

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