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apply: (Prototype.Browser.IE ? function(o, a) { | |
a = a || []; | |
switch (a.length) { | |
case 0: return this.call( o);// \ "FUUU...!" | |
case 1: return this.call( o,a[0]);// \ _ | |
case 2: return this.call( o,a[0],a[1]);// \ \o | |
case 3: return this.call( o,a[0],a[1],a[2]);// /\_ | |
case 4: return this.call( o,a[0],a[1],a[2],a[3]);// \ /\ | |
case 5: return this.call( o,a[0],a[1],a[2],a[3],a[4]);// > / | |
case 6: return this.call( o,a[0],a[1],a[2],a[3],a[4],a[5]);// > | |
case 7: return this.call(o,a[0],a[1],a[2],a[3],a[4],a[5],a[6]);// \ | |
} | |
return this._apply(o, a); | |
} : Function.prototype.apply), |
As I recall this was the solution to a weird error we encountered with cross-window js invocation in ie7.
apply() method didn't exist pre IE5.5 I believe. wrote that code circa 2006-2007.
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just riffing on https://gist.github.com/1099000/02cd631cb52ab159e5085c82cf8e14b5a164332f
Don't recall the original rational for the ua sniff. either early versions of IE didn't support apply(), or they weren't performant .vs. call().