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$.ajax({
    type: "POST",
    url: "arquivo.php",
    data: {
        "key1": "value1",
        "key2": "value1"
    },
    beforeSend: function(){
        // faça algo antes de enviar
    },
    error: function(xhr, ajaxOptions, thrownError){
        // alert(thrownError);
    },
    success: function(data){
	// faça algo com o 'data' que retornou
    }
});