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@@ -0,0 +1,71 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<meta charset="utf-8" />
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+<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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+
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+<title>Dice</title>
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+
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+<script>
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+
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+const DICE_NUM_MIN = 1;
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+const DICE_RAND_MIN = 1;
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+const DICE_RAND_MAX = 6;
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+
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+function rand_int(min, max) {
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+ return Math.floor(Math.random() * (max - min + 1)) + min;
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+}
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+
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+function rand_dice() {
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+ return rand_int(DICE_RAND_MIN, DICE_RAND_MAX);
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+}
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+
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+function get_dice_num() {
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+ n = parseInt(document.getElementById('dice_num').value);
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+ if(isNaN(n) || n < DICE_NUM_MIN) {
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+ return 1;
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+ }
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+ return n;
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+}
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+
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+function set_dice_num(n) {
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+ document.getElementById('dice_num').value = Math.max(n, DICE_NUM_MIN);
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+}
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+
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+function increment() {
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+ set_dice_num(get_dice_num() + 1);
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+}
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+
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+function decrement() {
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+ set_dice_num(get_dice_num() - 1);
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+}
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+
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+function prependChild(parent_tag, child_tag) {
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+ parent_tag.insertBefore(child_tag, parent_tag.firstChild);
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+}
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+
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+function roll() {
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+ roll_tag = document.createElement('div');
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+ dice_num = get_dice_num();
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+ for(i=0; i<dice_num; i++) {
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+ dice_tag = document.createElement('span');
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+ dice_tag.appendChild(document.createTextNode(rand_dice() + ' '));
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+ roll_tag.appendChild(dice_tag);
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+ }
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+ prependChild(document.getElementById('rolls'), roll_tag);
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+}
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+
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+</script>
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+
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+<p>
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+ dices
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+ <input type="text" id="dice_num" align="middle"
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+ type="number" min="1" size="2" value="6">
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+ <input type="button" onclick="decrement()" value="-">
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+ <input type="button" onclick="increment()" value="+">
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+ <input type="button" onclick="roll()" value="roll">
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+</p>
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+
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+<div id="rolls"></div>
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+
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+</html>
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