Примеры для .jquery

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Determine if an object is a jQuery object

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var a = { what: "A regular JS object" },
  b = $( "body" );
 
if ( a.jquery ) { // Falsy, since it's undefined
  alert( "a is a jQuery object!" );
}
 
if ( b.jquery ) { // Truthy, since it's a string
    alert( "b is a jQuery object!" );
}

Get the current version of jQuery running on the page

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alert( "You are running jQuery version: " + $.fn.jquery );