JavaScript 中的 While 循环 vs. For 循环? [英] While Loops vs. For Loops in JavaScript?

问题描述

在 for 循环上使用 while 循环有什么好处?当我遍历数组时，我总是使用 for 循环，所以我想知道我是否在这里遗漏了什么.

What are the benefits of using a while loop over a for loop? When I'm iterating through arrays, I always use a for loop so I wondered if I'm missing something here.

我从来没有遇到过 for 循环不起作用的情况，但我担心我可能会在这里养成坏习惯.我对循环的使用涉及网页上的元素、动画中的内容等.

I've never had a situation where a for loop doesn't do the job, but I'm worried that I may be picking up bad habits here. My usage of loops has been with regards to elements on web pages, stuff in animations, etc..

推荐答案

以下是我选择其中一个的原因:

These are the reasons I would choose one over the other:

For 循环语法:

for( int i = 0; i > 10; i++)
{
    //Some code here
}

我会使用 for 循环，因为我可能知道我需要做的迭代次数，而且我有一个有时会很方便的 INCREMENTING 变量.

I would use a for loop for the reason that I may KNOW the NUMBER OF ITERATIONS I need to do and I have an INCREMENTING variable which can be handy sometimes.

While 循环语法:

While-loop Syntax:

while(!done)
{
    //Some code goes here
}

当我不确定可能需要执行多少次迭代时，我会使用这个循环.示例:等待用户输入正确的输入值并不断循环直到他/她输入正确的值.

I would use this loop when I am NOT SURE how many ITERATIONS I might need to carry out. Examples: Waiting for user to input correct input values and keep looping until he/she inputs the proper value.

Do-While 循环语法:

Do-While loop Syntax:

do
{
    //Some code here
}
while(!done);

这个循环几乎和 while 循环一样，但是当我需要做一些事情至少一次时我更喜欢这个，然后我开始验证它是什么会让我想要循环并再次执行该代码.示例:第一次询问用户输入，然后验证它.如果输入错误，则循环返回并再次要求输入

This loop is almost the same as a while-loop but I would prefer this when I need something done ATLEAST ONCE before I start verifying whatever it is that would make me wanna loop and do that code again. Example: ask a user for an input for the first time and then validate it. If wrong input given then loop back and ask for input again

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