V8：创建新的变量范围

Question

In JavaScript, when I enter a new function, I get a new local variable scope. Eg like this:

function f() {
     var x = 42; // this is in our local variable scope
     // other code
}

I want to do the same now in V8. I have other code as a String and compile it via Script::Compile and run it via Script::Run .

Right now, I create a new Context but I think this is total overkill. It also means that I have to reinit my globals in the new context.

Answer 1

If I understand correctly, you want to get your C++ side script to run in a new isolated context, I assume because you don't want it accidentally aliasing or modifying the global environment. In that case, before you execute your code, do this:

std::string sScopedCode = "(function(){" + sYourCode + "})();"

That will ensure the code in sYourCode is kept isolated from other invocations you might make.