回答編集履歴
2
蛇足追加
test
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@@ -47,3 +47,237 @@
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```
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蛇足も追加
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```javascript
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<html lang="ja">
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<meta charset="utf-8">
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<title>sample</title>
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<style>
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main{
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position: relative;
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overflow: hidden;
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background: #f6f5f5;
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width: 980px;
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height: 200px;
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margin: auto;
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}
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div{
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font-size: 50px;
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float: left;
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width: 100px;
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height: 100px;
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background: #444;
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text-align: center;
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border-radius: 50px;
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line-height: 90px;
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}
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.plus{
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position: absolute;
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top:50px;
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left: 100px;
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}
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.minus{
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position: absolute;
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top: 50px;
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right: 100px;
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}
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</style>
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<body>
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<h1 class="count">0</h1>
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<main>
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<div class="plus">+</div>
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<div class="minus">-</div>
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</main>
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<h1 class="count">0</h1>
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<main>
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<div class="plus">+</div>
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<div class="minus">-</div>
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</main>
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<h1 class="count">0</h1>
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<main>
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<div class="plus">+</div>
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<div class="minus">-</div>
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</main>
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<script>
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class Counter {
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constructor (plus, minus, count, num = 0) {
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this.plus = plus;
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this.minus = minus;
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this.count = count;
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this.num = num;
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this.disp ();
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[plus, minus].forEach (e =>
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e.addEventListener ('mouseover', this, false));
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}
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up () {
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this.num += 1;
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this.disp ();
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}
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down () {
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this.num -= 1;
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this.disp ();
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}
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disp () {
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this.count.textContent = this.num;
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}
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handleEvent (event) {
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switch (event.type) {
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case 'mouseover' :
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let e = event.target;
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if (this.plus == e)
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this.up ();
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else if (this.minus == e)
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this.down ();
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break;
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}
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}
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}
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//___________________________________________
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function demo () {
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let
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plus = document.querySelectorAll ('.plus'),
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minus = document.querySelectorAll ('.minus'),
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count = document.querySelectorAll ('.count');
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Array(3).fill(0).forEach ((_,i) => {
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new Counter (plus[i], minus[i], count[i]);
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});
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}
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window.addEventListener('DOMContentLoaded', demo, false);
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</script>
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```
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1
修正
test
CHANGED
|
@@ -1,6 +1,8 @@
|
|
|
1
1
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あまりこういう書き方はお勧めしないかな？
|
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2
2
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3
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その昔、メモリーリークパターンだって教えられたから。
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3
4
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|
5
|
+
（今は解決済みらしいのだけれど）
|
|
4
6
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5
7
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```jaascript
|
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6
8
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