<meta charset="utf-8">
<input/>
<button>Verificar si acerto con el secreto</button>
<script>
var secreto = Math.round(Math.random()*10);
var input = document.querySelector("input");
input.focus();
function verificar(){
if(parseInt(input.value) == secreto){
alert("Usted acerto");
} else {
alert("Usted erro");
}
input.value = "";
input.focus();
}
var button = document.querySelector("button");
button.onclick = verificar;
</script>
