回答編集履歴
2
調整
test
CHANGED
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@@ -2,11 +2,7 @@
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2
2
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3
3
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start.addEventListener('click',function(){
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4
4
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5
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-
startTime = Date.now(); // スタート
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6
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-
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7
5
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this.className = 'pushed';
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8
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-
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9
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-
stop.className = '';
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10
6
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11
7
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});
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12
8
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@@ -18,11 +14,7 @@
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18
14
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19
15
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start.addEventListener('click',()=>{
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20
16
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21
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-
startTime = Date.now();
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22
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-
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23
17
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this.className = 'pushed';
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24
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-
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25
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-
stop.className = '';
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18
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27
19
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});
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28
20
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@@ -36,11 +28,7 @@
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36
28
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37
29
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start.addEventListener('click',e=>{
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38
30
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39
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-
startTime = Date.now();
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40
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-
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41
31
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e.target.className = 'pushed';
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42
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-
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43
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-
stop.className = '';
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44
32
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45
33
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});
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46
34
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1
調整
test
CHANGED
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@@ -30,18 +30,20 @@
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30
30
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31
31
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における、thisはwindowを示すので駄目です
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32
32
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33
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-
こういう場合は
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33
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+
こういう場合はイベントを拾って
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34
34
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35
35
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```javascript
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36
36
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37
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-
start.addEventListener('click',
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37
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+
start.addEventListener('click',e=>{
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38
38
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39
39
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startTime = Date.now();
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40
40
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41
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-
t
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41
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+
e.target.className = 'pushed';
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42
42
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43
43
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stop.className = '';
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44
44
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45
45
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});
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46
46
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47
47
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```
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48
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+
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49
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+
という書き方をしてください
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