什么是标志变量？ [英] What is a flag variable?

问题描述

最近我刚刚遇到这个术语，我不知道它的用途是什么？

Recently I just came across this term and I had no idea as to what purpose it serves?

我不确定何时使用标志变量以及如何使用要解决这个问题吗？

I am little unsure about when to use a flag variable and how to go about it?

我用Google搜索了它，但没有任何与之相关的具体示例（在JavaScript的上下文中）。

I Googled it but there were not any specific examples related to it (in the context of JavaScript).

推荐答案

标志变量定义和使用说：

标志变量，最简单的形式，是一个变量，你定义为一个值，直到某些条件为真，在这种情况下，您更改变量的值。它是一个变量，可用于控制函数或语句的流程，允许您在函数进行时检查某些条件。

A flag variable, in its simplest form, is a variable you define to have one value until some condition is true, in which case you change the variable's value. It is a variable you can use to control the flow of a function or statement, allowing you to check for certain conditions while your function progresses.

作为一个例子：

// errors is the flag var
var errors = 0;

for(var i = 0; i < 10; i++)
  if(i == 6) // your error condition
    errors++;

if(errors)  // is the flag "up"? (i.e. > 0)
  alert("There was a problem!");

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