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Fetching all (javascript) global variables in a page
My application is using global variables in javascript. Is there a way to find how many of them are there?
Thanks Om
597
Global Variables in JavaScript Explained. Global variables are declared outside of a function for accessibility throughout the program, while local variables are stored within a function using var for use only within that function’s scope. If you declare a variable without using var, even if it’s inside a function, it will still be seen as global:
Declaring JavaScript global variable within function To declare JavaScript global variables inside function, you need to use window object. For example: window.value=90; Now it can be declared inside any function and can be accessed from any function.
Alternatively, assign the property to a window because, in browsers, global variables declared with var are properties of the window object: In ECMAScript 2015 specification, let, class, and const statements at global scope create globals that are not properties of the global object.
Global variables are declared outside of a function for accessibility throughout the program, while local variables are stored within a function using var for use only within that function’s scope. If you declare a variable without using var, even if it’s inside a function, it will still be seen as global:
I made one.
var GlobalTester = (function(){
var fields = {};
var before = function(w){
for(var field in w){
fields[field] = true;
};
};
var after = function(w){
for(var field in w){
if(!fields[field]){
console.log(field + " has been added");
}
};
};
return {before: before, after:after};
}());
GlobalTester.before(window);
// Run your code here
window.blar = "sdfg";
GlobalTester.after(window);
This will output blar has been added in the console
187
Try this in your browser developer window (F12):
Object.keys(window).length
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