禁用功能的视图代码(Disable view code of function)

禁用功能的视图代码(Disable view code of function)

像这样，如果我做了一个功能：

function a() { alert("Hello!") }

我不希望你能够像以下一样查看代码：

eval(a)

返回所有代码但是

eval(a())

返回警报

在做eval时（一）我希望它不返回代码，什么都没有？

Like this, if I made a function:

function a() { alert("Hello!") }

I don't want you to be able to view the code like:

eval(a)

Returns all the code but

eval(a())

Returns the alert

When doing eval(a) I want it to not return the code, just nothing how?

最满意答案

始终将代码封装在IIFE（立即调用的函数表达式）中，这样您就不会将变量泄漏到全局范围：

(function(){ function a() { alert("Hello!") } // more stuff... }()); console.log(eval(a)); //=> Uncaught ReferenceError: a is not defined

您还可以使用一个小技巧来使用bind隐藏功能代码：

var a = function a() { alert("Hello!") }.bind(); console.log(eval(a)); //=> function () { [native code] }

无论何时考虑使用eval ，请三思而后行，这可能是一种更好的方法。 如果您只想运行该函数，只需执行a() 。 那里不需要eval 。

Always encapsulate your code in an IIFE (Immediately Invoked Function Expression) so you don't leak variables to the global scope:

(function(){ function a() { alert("Hello!") } // more stuff... }()); console.log(eval(a)); //=> Uncaught ReferenceError: a is not defined

You can also use a little trick to hide the function code with bind:

var a = function a() { alert("Hello!") }.bind(); console.log(eval(a)); //=> function () { [native code] }

Whenever you think about using eval, think twice, there's probably a better way to do it. If you just want to run the function, just do a(). No need for eval there.