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JavaScript    
n.
Java描述语言[一种在HTML上使用的描述语言,能提高HTML的操作能力]

Java描述语言[一种在HTML上使用的描述语言,能提高HTML的操作能力]

(Formerly "LiveScript") {Netscape}'s simple,
cross-{platform}, {World-Wide Web} {scripting language}, only
very vaguely related to {Java} (which is a {Sun} trademark).
JavaScript is intimately tied to the {World-Wide Web}, and
currently runs in only three environments - as a {server}-side
{scripting} language, as an embedded language in
{server-parsed HTML}, and as an embedded language run in web
{browsers} where it is the most important part of {DHTML}.

JavaScript has a simplified {C}-like {syntax} and is tightly
integrated with the browser {Document Object Model}. It is
useful for implementing enhanced {forms}, simple web
{database} {front-ends}, and navigation enhancements. It is
unusual in that the {scope} of {variables} extends throughout
the function in which they are declared rather than the
smallest enclosing block as in C.

JavaScript originated from {Netscape} and, for a time, only
their products supported it. {Microsoft} now supports a
work-alike which they call JScript. The resulting
inconsistencies make it difficult to write JavaScript that
behaves the same in all browsers. This could be attributed to
the slow progress of JavaScript through the standards bodies.

JavaScript runs "100x" slower than {C}, as it is purely
interpreted ({Java} runs "10x" slower than C code).
{Netscape} and allies say JavaScript is an "open standard" in
an effort to keep {Microsoft} from monopolising web software
as they have desktop software. {Netscape} and {Sun} have
co-operated to enable {Java} and JavaScript to exchange
messages and data.

See also {VBScript}.

{Usenet} newsgroup: {news:comp.lang.javascript}.

Mailing List: ("subscribe javascript"
in body).

(2003-04-28)


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  • Which equals operator (== vs ===) should be used in JavaScript . . .
    JavaScript has two sets of equality operators: === and !==, and their evil twins == and != The good ones work the way you would expect The good ones work the way you would expect If the two operands are of the same type and have the same value, then === produces true and !== produces false
  • javascript - When should I use ?? (nullish coalescing) vs || (logical . . .
    ) in JavaScript only considers null or undefined as "nullish" values If the left-hand side is any other value, even falsy values like "" (empty string), 0 , or false , it will not use the right-hand side:
  • How do you use the ? : (conditional) operator in JavaScript?
    It's a little hard to google when all you have are symbols ;) The terms to use are "JavaScript conditional operator" If you see any more funny symbols in JavaScript, you should try looking up JavaScript's operators first: Mozilla Developer Center's list of operators The one exception you're likely to encounter is the $ symbol
  • What does the !! (double exclamation mark) operator do in JavaScript . . .
    A third use is to produce logical XOR and logical XNOR In both C and JavaScript, a b performs a logical AND (true if both sides are true), and a b performs a bitwise AND a || b performs a logical OR (true if at least one are true), and a | b performs a bitwise OR
  • How to use OR condition in a JavaScript IF statement?
    In JavaScript, if you're looking for A or B, but not both, you'll need to do something similar to:
  • Whats the difference between and in JavaScript?
    This operator is almost never used in JavaScript Other programming languages (like C and Java) use it for performance reasons or to work with binary data In JavaScript, it has questionable performance, and we rarely work with binary data This operator expects two numbers and returns a number In case they are not numbers, they are cast to
  • javascript - What does [object Object] mean? - Stack Overflow
    In JavaScript there are 7 primitive types: undefined, null, boolean, string, number, bigint and symbol Everything else is an object Everything else is an object The primitive types boolean , string and number can be wrapped by their object counterparts
  • Difference between == and === in JavaScript - Stack Overflow
    JavaScript has both strict and type-converting equality comparison For strict equality the objects being compared must have the same type and: Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions





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