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Detectar cuándo se ha abierto una página web usando Javascript

Tiempo de lectura: < 1 minuto

Hola, hoy vamos a ver cómo podemos detectar con Javascript, cuándo se ha abierto una pantalla web, por ejemplo, para refrescar su contenido.

Para detectar cuando se ha abierto se utiliza la siguiente funcion:

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EnlighterJS 3 Syntax Highlighter
$(window).focus(function () {
console.log("focus web abierta");
});
$(window).focus(function () { console.log("focus web abierta"); });
$(window).focus(function () {
console.log("focus web abierta");
});

Para detectar que se cierra usamos esta función:

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EnlighterJS 3 Syntax Highlighter
$(window).blur(function () {
console.log("blur web cerrada");
});
$(window).blur(function () { console.log("blur web cerrada"); });
$(window).blur(function () {
  console.log("blur web cerrada");
});
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