Javascript 我如何在javascript中的函数之间传递变量
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4600508/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do i pass variables between functions in javascript
提问by Hussein
Here are 2 functions in the simplest form. I'm working with jquery. What is the best way to pass var str from the first function to the second one.
这是最简单形式的 2 个函数。我正在使用 jquery。将 var str 从第一个函数传递到第二个函数的最佳方法是什么。
function a() {
var str = "first";
};
function b() {
var new = str + " second";
};
回答by Nick Craver
You need to either pass it between them, or it seems from your example, just declare it in a higher scope:
您需要在它们之间传递它，或者从您的示例看来，只需在更高的范围内声明它：
var str;
function a(){
str="first";
}
function b(){
var something = str +" second"; //new is reserved, use another variable name
}
回答by Jacob Relkin
Use function parameters, like this:
使用函数参数，像这样：
function a() {
var str = "first";
b(str);
}
function b(s) {
var concat = s + " second";
//do something with concat here...
}
You couldjust declare a variable higher up in the scope chain, but I opt to use arguments to restrict variable access to only the contexts that absolutely need it.
您可以在作用域链的更高层声明一个变量，但我选择使用参数将变量访问限制在绝对需要它的上下文中。
Oh yeah, isn't that called the principle of least privilege?
哦对了，这不就是所谓的最小特权原则吗？
