Use closure to store some private data, which is accessible by the returned function but not to the outside code.
var setup =
function () {
var count = 0
;
return function () {
return (count += 1
);
};
};
// usage
var next =
setup();
next(); // returns 1
next(); // 2
next(); // 3
转载于:https://www.cnblogs.com/haokaibo/p/Returning-Functions.html
