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October 16, 2018 16:26
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a meaningful shim limited to the first argument only of `Object.create()`, able to create empty dictionaries too such `inherit(null)` even in older browsers, down to IE5, without `__proto__` and/or without ES5 `Object.create()` support.
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/*!(C) WebReflection *//** @license Mit Style */ | |
// inspired by https://gist.github.com/4395291 | |
this.inherit || (this.inherit = function(create){ | |
if (!create) { | |
if ({__proto__:null} instanceof Object) { | |
for (var | |
Null = function Null() {}, | |
doc = document, | |
html = doc.documentElement, | |
iframe = html.insertBefore( | |
doc.createElement("iframe"), | |
html.lastChild | |
), | |
// works down to IE7, it does NOT work in IE6 | |
NullPrototype = Null.prototype = | |
(iframe.src = "javascript:", iframe.contentWindow.Object.prototype), | |
/* this would work in IE6 too | |
idoc = iframe.contentWindow.document || | |
iframe.contentDocument || | |
iframe.document, | |
NullPrototype = Null.prototype = ( | |
idoc.open(), | |
idoc.write( | |
"<script>parent.inherit=Object.prototype<" + | |
"/script>" | |
), | |
idoc.close(), | |
inherit | |
), | |
//*/ | |
xtend = html.removeChild(iframe) && function xtend(object) { | |
return xtend.prototype === object ? | |
(xtend.prototype = xtend, this) : | |
new xtend(xtend.prototype = object) | |
; | |
}, | |
proto = [ | |
"hasOwnProperty", | |
"isPrototypeOf", | |
"propertyIsEnumerable", | |
"valueOf", | |
"toString", | |
"toLocaleString", | |
"constructor" | |
], | |
i = proto.length; i--; | |
) delete NullPrototype[proto[i]]; | |
// you know ... IE, leaks, and shit ... | |
create = doc = html = iframe = NullPrototype = proto = | |
function(object) { | |
return object == null ? new Null : xtend(object); | |
} | |
; | |
} else { | |
create = function(object) { | |
return {__proto__: object}; | |
}; | |
} | |
} | |
return function(object) { | |
return create(object); | |
}; | |
}(Object.create)); |
Yap your IE solution is like the one in shim-sham. It can be extended to work in IE6 https
using ActiveXObject('htmlfile')
instead. It's less code too. I did this with sandboxed natives (one of the techniques was getting natives from an iframe, the other from an ActiveX control, and then lastly custom constructors that rewired object's proto's).
Here is a link to the shim-sham issue w/ iframes and document.domain
:
github.com/kriskowal/es5-shim/issues/150.
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