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<a href="http://tutovisuel.com/">Changer la destination</a>

var obj = document.querySelector("a"); // cible la balise a
document.write( "<br> Valeur de href avant : "+ obj.getAttribute("href") ); // on récupère la valeur de href
obj.setAttribute("href","https://openclassrooms.com");
document.write( "<br> Valeur de href après : "+ obj.getAttribute("href") ); // on récupère la nouvelle valeur de href

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