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Teste se um Elemento HTML Existe com e sem Jquery

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/*Com JQuery */
if( $('#id_do_elemento').length ) {
//Codigo
}
/* metodo tradicional sem JQuery */
if(document.getElementById('id_do_elemento') != null)
{
//Codigo
}
 
/* com o seletor do JQuery sempre nos retornará uma array de objetos tipados, logo a instrução length no auxilia nisto */
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