什么是最好的方法来存储一个值在以后的函数中使用？我听说全球变数是邪恶的 [英] What is the best way to store a value for use in a later function? I'm hearing global variables are evil

问题描述

所以我使用的代码是 http://jsfiddle.net/8j947/10/ ，它会为变量isLive返回true或false值。我如何在后面的函数中使用变量onLive？我在上阅读答案，而不使用全局变量从其他函数访问变量，但是我很难让它正常工作。我所需要的只是存储值，true或false，所以我可以在后面的函数中将它调用到if语句中。任何人都可以给我最简单的方法来做到这一点？有没有一种方法可以将数据存储为对象？

So the code I'm using is at http://jsfiddle.net/8j947/10/ and it returns a value of true or false for the variable isLive. How can I use the variable onLive in a later function? I read the answers at Accessing variables from other functions without using global variables, but I'm having a lot of trouble getting it to work. All I want is to store the value, true or false, so I can call it into an if statement in a later function. Can anyone give me the simplest way to do this? Is there a way to store the data as an object?

推荐答案

全局变量被认为是邪恶的，因为任何函数都可能无意中修改你的变量，这可能会导致一些难以追踪的错误。对于简单的项目来说，这通常不是问题，但应该考虑一下。

Global variables are considered "evil", because any function could inadvertently modify your variable, which can cause some hard-to-track bugs. This usually isn't a problem for simple projects, but it's something you should think about.

保存一个值而不会混淆全局命名空间，从而减少上述错误的风险，您可以创建自己的名称空间对象（您链接的问题中接受答案的选项2）。像这样：

To save a value without muddying the global namespace too much, and thus reduce the risk of the aforementioned bugs, you can create you own "namespace" object (Option 2 of the accepted answer in the question you linked). Like so:

var MyPageData = {};

MyPageData.someProperty = someFunc();

// Later on...

function anotherFunc() {
    // Use the data you set...
    alert(MyPageData.someProperty);
}

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