Question

Javascript functions are objects and they have scope chain associated with them. If some closure exists with a function that has a different scope chain than the one that was in effect when they were defined.As an example invoking function is a returned function object from some other (parent) function that had a scope chain with a large number of private variables, so invoking function will use the already existing inherited scope chain of parent function as well as bounded old variables.

在不考虑上级职能的情况下,是否可检查与范围链有关的变量?

理想的情况是,必须跟踪父母职能中确定的变数,我的问题是没有考虑父母的职能,我们能否看到与范围链有关的变数?

如果是(任何方法?)我们能检查与范围链有关的变数的现值?

也可以给人提供范围链的结构(至少我知道它不像万国邮联那样的杂货,而是什么东西)。

Answer 1

在相同情况下创建的职能可使用范围变数(Java 文本在功能上范围)。

你可以与他们接触,但你可以采取报告他们的方法。如果这是共同的要求,我建议把内部变量放在“组合”变量中:

var obj = (function (config) {
return {
  getTest: function () {
    return config.test;
  }
};
}({test: 1}));

Nick Zackas has done a good presentation about the scope chain (I think it s here: http://googlecode.blogspot.com/2009/06/nicholas-c-zakas-speed-up-your.html)

否则,使用 Chrome等开发工具的浏览器(Firebug常常忘记了范围变量是什么)。

友情链接