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To confirm a match in a memory game using JavaScript, you can use the following steps:

1. Create two variables to store the values of the cards that the user selects.
2. When the user selects a card, store its value in one of the variables.
3. When the user selects another card, store its value in the second variable.
4. Compare the values of the two variables. If they match, the user has found a pair, and you can confirm the match.
5. If the values do not match, you can display a message to the user that the cards do not match and ask them to select again.

Here is an example code for confirming a match in a memory game:

// Initialize variables to store the selected cards
var card1 = "";
var card2 = "";

// When user selects a card
function selectCard(cardValue) {
  // If it's the first card, store its value in card1
  if (card1 === "") {
    card1 = cardValue;
  }
  // If it's the second card, store its value in card2
  else if (card2 === "") {
    card2 = cardValue;
    // Compare values and confirm match if they are equal
    if (card1 === card2) {
      confirmMatch();
    }
    // If values do not match, show message and reset variables
    else {
      showMessage();
      card1 = "";
      card2 = "";
    }
  }
}

// Function to confirm match
function confirmMatch() {
  alert("Congratulations! You found a match!");
  card1 = "";
  card2 = "";
}

// Function to show message when cards do not match
function showMessage() {
  alert("Sorry, these cards do not match. Please try again.");
}

Note that in this example, the selectCard function is called whenever a user clicks on a card. The cardValue parameter represents the value of the card that the user has selected. The code first checks if it's the first card the user has selected. If it is, the cardValue is stored in the card1 variable. If it's the second card, the cardValue is stored in the card2 variable, and the values of card1 and card2 are compared.

If the values match, the confirmMatch function is called, which displays a message to the user and resets the card1 and card2 variables. If the values do not match, the showMessage function is called, which displays a message to the user and resets the card1 and card2 variables.