回答編集履歴
2
typo
test
CHANGED
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@@ -20,7 +20,7 @@
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20
20
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21
21
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if (!elem) {
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22
22
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23
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-
alert('elem
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23
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+
alert('elem is null');
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24
24
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25
25
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} else {
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26
26
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1
コード追記
test
CHANGED
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@@ -4,4 +4,34 @@
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4
4
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5
5
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6
6
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7
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+
```JavaScript
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8
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+
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9
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+
(function(){
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10
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+
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11
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+
var elem = document.getElementById(prompt("idを入力してください"));
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12
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+
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13
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+
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14
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+
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15
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+
resize();
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16
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+
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17
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+
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18
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+
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19
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+
function resize() {
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20
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+
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21
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+
if (!elem) {
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22
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+
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23
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alert('elem us null');
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24
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+
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25
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} else {
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26
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+
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27
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+
elem.style.width = window.innerWidth + 'px';
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28
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+
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29
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+
}
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30
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+
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31
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+
}
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32
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+
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33
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+
})();
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34
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+
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35
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+
```
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36
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+
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7
37
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Re: Spinoza さん
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