What does the sign mean in jQuery or JavaScript

Question

Possible Duplicate    What is the meaning of  ldquo   rdquo  sign in JavaScript       Now this must seem to be an easy and stupid question to ask but I must know why we use the dollar     symbol in jQuery and JavaScript  I always put a dollar in my scripts but I actuary don t know why   For an example       Text   click function            Text   css  color    red         This just changes the text colour when you click it  but it demonstrates my point

User · Answer

The jQuery syntax is tailor made for selecting HTML elements and perform some action on the element(s).

Basic syntax is: $(selector).action()

A dollar sign to define jQuery A (selector) to "query (or find)" HTML elements A jQuery action() to be performed on the element(s)

More on this

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In JavaScript it has no special significance  no more than a or Q anyway   It is just an uninformative variable name   In jQuery the variable is assigned a copy of the jQuery function  This function is heavily overloaded and means half a dozen different things depending on what arguments it is passed  In this particular example you are passing it a string that contains a selector  so the function means  Create a jQuery object containing the element with the id Text

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Additional to the jQuery thing treated in the other answers there is another meaning in JavaScript - as prefix for the RegExp properties representing matches  for example    test  match   t e st     alert  RegExp  1      will alert  e   But also here it s not  magic  but simply part of the properties name

User · Answer

The   is just a function  It is actually an alias for the function called jQuery  so your code can be written like this with the exact same results   jQuery   Text   click function        jQuery   Text   css  color    red

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The   symbol simply invokes the jQuery library s selector functionality  So     Text   returns the jQuery object for the Text div which can then be modified

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In jQuery  the   sign is just an alias to jQuery    then an alias to a function   This page reports      Basic syntax is    selector  action            A dollar sign to define jQuery   A  selector  to  query  or find   HTML elements   A jQuery action   to be performed on the element s

[javascript] What does the "$" sign mean in jQuery or JavaScript?

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