回答編集履歴
1
chousei
answer
CHANGED
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@@ -3,5 +3,6 @@
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3
3
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var str = 'abc';
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4
4
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var posi = 2;
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5
5
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var reg=new RegExp("^(.{"+(posi-1).toString()+"}).");
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6
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+
str=str.replace(reg,'$1');
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6
7
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console.log(str);
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7
8
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```
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