如何在JavaScript中的函数之间传递变量?

问题描述：

这里有2个最简单形式的函数.我正在使用jquery.

Here are 2 functions in the simplest form. I'm working with jquery.

将var str从第一个函数传递给第二个函数的最佳方法是什么?

What is the best way to pass var str from the first function to the second one?

function a() {
    var str = "first";
};

function b() {
    var new = str + " second";
};

答

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即可:

You need to either pass it between them, or it seems from your example, just declare it in a higher scope:

var str;
function a(){
  str="first";
}
function b(){
  var something = str +" second"; //new is reserved, use another variable name
}