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请输入英文单字，中文词皆可：

undefined    音标拼音: [,ʌndɪf'ɑɪnd]
a. 不明确的,未下定义的

不明确的,未下定义的

undefined
未定义的; 未定界的 UNDEF

undefined
未定义

undefined
adj 1: not precisely limited, determined, or distinguished; "an
undefined term"; "undefined authority"; "some undefined
sense of excitement"; "vague feelings of sadness"; "a
vague uneasiness" [synonym: {undefined}, {vague}] [ant:
{defined}]

Undefined \Undefined\
See {defined}.

137 Moby Thesaurus words for "undefined":
aleatoric, aleatory, all-knowing, all-powerful, all-seeing,
all-wise, almighty, amorphic, amorphous, anarchic, anonymous,
baggy, blear, bleared, bleary, blobby, blurred, blurry, boundless,
broad, chance, chancy, changeless, chaotic, characterless,
confused, creating, creative, cryptonymic, cryptonymous, dark, dim,
disordered, disorderly, eternal, eternally the same, everlasting,
faint, featureless, feeble, filmy, foggy, formless, fuzzy, general,
glorious, good, half-seen, half-visible, hallowed, hazy, highest,
hit-or-miss, holy, ill-defined, immortal, immutable, imprecise,
inaccurate, inchoate, incognito, incoherent, inconspicuous,
indecisive, indefinable, indefinite, indeterminable, indeterminate,
indistinct, indistinguishable, inexact, infinite, inform,
innominate, just, kaleidoscopic, lax, limitless, loose, loving,
low-profile, luminous, lumpen, majestic, making, merciful,
merely glimpsed, misty, nameless, nondescript, nonspecific,
numinous, obscure, omnipotent, omnipresent, omniscient, one,
orderless, out of focus, pale, permanent, perpetual, radiant,
random, sacred, semivisible, shadowed forth, shadowy, shapeless,
shaping, sovereign, stochastic, supreme, sweeping, timeless,
ubiquitous, unacknowledged, unbounded, uncertain, unchanging,
unclear, undesignated, undestined, undetermined, unidentified,
unknown, unlimited, unnamed, unordered, unorganized, unplain,
unrecognizable, unspecified, vague, veiled, weak, without a name


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undefined查看　undefined　在百度字典中的解释百度英翻中〔查看〕
undefined查看　undefined　在Google字典中的解释Google英翻中〔查看〕
undefined查看　undefined　在Yahoo字典中的解释Yahoo英翻中〔查看〕

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英文字典中文字典相关资料:


  • How can I check for undefined in JavaScript? - Stack Overflow
    definedButNotInitialized in window: true definedAndInitialized in window: false someObject firstProp in window: false someObject secondProp in window: false someObject undefinedProp in window: true notDefined in window: Exception--ReferenceError: notDefined is not defined "definedButNotInitialized" in window: false "definedAndInitialized" in
  • What is the difference between null and undefined in JavaScript?
    undefined cannot be an empty wall if the holder represents the variable In this representation, undefined is an empty holder while null is an empty holder with post-it note empty (so the unfortunate user knows it's useless to ask the cleaning lady for toilet paper)
  • JavaScript checking for null vs. undefined and difference between . . .
    Undefined shows that a variable is declared but it is not assigned a value Null shows that a variable is deliberately set to null; Undefined happens most of the time in unintentional cases while null happens for intentional purposes
  • How to check for an undefined or null variable in JavaScript?
    Strict equality checks (===) should be used in favor of == The only exception is when checking for undefined and null by way of null Check for both undefined and null values, for some important reason undefOrNull == null; EDIT 2021-03: Nowadays most browsers support the Nullish coalescing operator (??
  • javascript - How to compare variables to undefined, if I don’t know . . .
    undefined used to be mutable, like undefined = 1234 what would cause interesting results But after Ecmascript 5, it's not writable anymore, so we can use the simpler version But after Ecmascript 5, it's not writable anymore, so we can use the simpler version
  • Spring Boot: Database Driver: unknown undefined Error While . . .
    Database JDBC URL [Connecting through datasource 'HikariDataSource (HikariPool-3)'] Database driver: undefined unknown Database version: 9 0 1 Autocommit mode: undefined unknown Isolation level: undefined unknown Minimum pool size: undefined unknown Maximum pool size: undefined unknown
  • Cómo determinar si una variable es undefined o null en JavaScript
    NOTA: Véase la respuesta de amandiel en la que aclara la diferencia entre 'undefined' (cadena) y undefined (palabra reservada) o bien undefined (artículo de Mozilla Developers Network) Fragmento En el siguiente ejemplo se ha reemplazado 'undefined' por null y se han ajustado los mensajes a imprimir para cada caso
  • Detecting an undefined object property - Stack Overflow
    There is a difference between an undefined member and a defined member with an undefined value But unhappily typeof obj foo does not tell us which of the three cases we have However we can combine this with "foo" in obj to distinguish the cases | typeof obj x === 'undefined' | !("x" in obj) 1 { x:1 } | false | false 2
  • How to check undefined in TypeScript - Stack Overflow
    But it overlooks the potential that a variable by the name of undefined may actually exist -however unlikely- and would therefore then not be of type undefined In that case, the comparison will return false To be correct one would have to declare a constant of type undefined for example: const _undefined: undefined and then test by:





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