从……执行自包含的javascript

Question

I have javascript that is being generated at design time that needs to be executed to find a value at run time. The code is stored as a string in an object and I would like to be able to execute it and retrieve the value and then scrap the code. Is there a way to do this? Do I have to use eval() ?

Answer 1

You can use eval(String)

Or use new Function (String)

Or use document.createElement

[edited]

Depend on how it was done your code

1 - if those strings are saved in shared across different pages (with cookies or database ), then SERVER-SIDE you can generate a tag <script> with the values ​​saved in a JSON for quick access.

2 - If the strings are saved only at runtime (ie in pagination are not recoverable values) you may not need to save these values ​​in Strings , talves you can create a global Json in Window Object (eg. window.MyObjectGlobal) , making the values ​​accessible at any time on the page (since there is no paging) - is idea can also be reused in case of using the SERVER-SIDE , combined with Ajax (ajax only to save the data in your database), or document.cookie (but will have to use document.createElement("script") or eval )

Good luck

Answer 2

Yes, you can do that using eval .

However, remember eval is evil and it could potentially introduce security risks. Anyway, if you know what you're doing, that's the way to go