你能调用一个在调用者的上下文中返回的函数吗？

Question

I don't think this is possible, but hey you never know. I'm curious if this is possible to do in common languages. My examples will be in JavaScript, but I'd be curious to know if this can be done in Python, PHP, Java, etc.

Let's say there are two functions.

var printX = function(x){
    checkX(x, this);
    console.log(x);
}
var checkX = function(x, caller){
    if (x > 10){
        caller.return;
    }
}
printX(5);  //Prints 5
printX(15); //Doesn't print anything

Obviously there are much better ways of expressing this, I'd just like to know if the concept is possible.

Answer 1

Normally, if you want to stop the code that called your function, you throw an exception:

var printX = function(x) {
    checkX(x);
    document.write(x);
}
var checkX = function(x) {
    if (x > 10) {
        throw "exit";
    }
}

try { printX(5)  } catch(e) {}  
try { printX(15) } catch(e) {}

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