question:
Code:
for (var i = 0; i < btns.length; iPP) {
(function(j) {
btns[j].onclick = function(i) {
console.log("" + (i + 1) + "");
};
})(i);
}to understand closures, you need to understand the JS garbage collection (GC) mechanism. this article is more specific.
as far as the landlord's question is concerned, the answer is
var j = I
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