Examples of advanced usage of javascript closures_javascript skills

Extension
Code:

Copy code The code is as follows:

var blogModule = (function ( my) {
my.AddPhoto = function () {
//Add internal code
};
return my;
}(blogModule));

Say:
Pass itself into the method, and then implement the expansion of the method, which is a bit like assembling parts
Code:

Copy code The code is as follows:

var blogModule = (function (my) {var oldAddPhotoMethod = my.AddPhoto;
my.AddPhoto = function () { // Overloaded method, The old method can still be called through oldAddPhotoMethod}; return my;}(blogModule));

Say:
The advantage is that you can call the previous method.
Clone and inheritance
Code:

Copy code The code is as follows:

var blogModule = (function (old) { var my = {}, key; for (key in old) { if (old.hasOwnProperty(key)) { my[key] = old[key]; } } var oldAddPhotoMethod = old. AddPhoto; my.AddPhoto = function () { // After cloning, it has been rewritten. Of course, you can continue to call oldAddPhotoMethod }; return my; } (blogModule));

Say:
Simple cloning implementation
Share private objects across files
Code:

Copy code The code is as follows:

var blogModule = (function (my) { var _private = my._private = my._private || {}, _seal = my._seal = my._seal || function () { delete my._private; delete my._seal; delete my._unseal; }, _unseal = my._unseal = my._unseal || function () { my._private = _private; my._seal = _seal; my._unseal = _unseal; }; return my; } (blogModule || {}));

Say:
blogModule._seal() locks and _unseal() unlocks to privatize internal variables. I think this implementation is not the best, but we can learn this unlocking and locking function.