Why can anonymous functions defined with `var` be called in global scope?
function setupSomeGlobals() {
// Local variable that ends up within closure
var num = 666;
// Store some references to functions as global variables
var gAlertNumber = function() { console.log(num); }
}
setupSomeGlobals();
gAlertNumber(); //works, WHY?!!
console.log(num); //does not work, GOOD
我希望gAlertNumber（）不能在setupSomeGlobals（）函数之外工作......
Variables declared with var are always going to be local and won't be accessible from the outside.
If you run this in the console, it is more likely that you might have polluted the global namespace through earlier tries. Open a new tab and run the code again.
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