javascript Global undefined
@March 15, 2008, 1:22 a.m.
undefined | Firefox/Netscape/NN 6 IE 5.5(Win) ECMA 2 |
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While the undefined data type has been in ECMAScript and browsers since very early times, only recently was it also elevated to a formal property of the Global object. Despite the recent compatibility ratings, you can use its data type (accessed in string form via the typeof operator) comfortably in older browsers. |
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