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Dev:Hijacking
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If possible, hijacking a function is preferable to overriding it, as it is less invasive and thus more future-proof.
[edit] Example
Hijacking global function sampleFunc:
(function() { // closure to create local scope for backup // backup original function var sampleFunc_orig = sampleFunc; // override original function window.sampleFunc = function(foo, bar, baz) { // arguments correspond to original function signature // perform custom operations /* ... */ // invoke the original function return sampleFunc_orig.apply(this, arguments); }; })();
The wrapping function technique illustrated here is optional, but recommended to avoid clashes with other hijacks.
