这个while块是如何工作的? [英] How does this while block work?

问题描述

var result = 1
var counter = 0
while (counter < 10) {
     result = result * 2
     counter += 1
};

console.log(result);

我很困惑计数器更新结果如何?我们将计数器加 1，但这对结果有何影响?

I am confused how does counter update result here? We are increasing counter by 1 but how does that affect the result?

有人可以把它告诉我吗?我是编程新手.

Can someone please dumb it down to me? I am new to programming.

我知道这个问题已经被问过很多次了.我搜索了很多答案，但没有得到我需要的信息.我有一个非常具体的疑问，想澄清一下，所以请轻点那个向下按钮.:)

Edit : I know this question has been asked many times. I searched through many answers but didn't get the info I required. I have a very specific doubt and wanted to clarify it so please go easy on that down button. :)

[已解决]

与 for 循环相同的代码.

Same code with for loop.

var result = 1
for (counter = 0; counter < 10; counter++) {
  result *= 2;
};
console.log(result);

推荐答案

result 和 counter 在此代码中是具有不同目标的独立变量.

result and counter are separate variables with different goals in this code.

counter 像

 counter += 1

所以最终 while 条件

while (counter<10)

将得到满足，代码将停止执​​行.

will be satisfied and the code will cease to execute.

对于result，每次执行while块中的代码，result乘以2更新

As for result, each time the code in the while block is executed, result updated by multiplying by 2

result = result*2

它是更新的"，因为变量 result 是在 while 循环之外初始化的，但可以被它访问.使用上述语句，它将现有的 result 变量乘以 2，然后将其存储回 result.

It is 'updated' because the variable result was initialized outside the while loop but is accessible by it. With the above statement, it is taking the existing result variable and multiplying it by 2 then storing it back in result.

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