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2021-Kaoka-gamedesign / a / strtest.js
@KAOKA Daisuke KAOKA Daisuke on 3 Dec 2021 120 bytes データ整理
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var str = 'user-123';
 
// 0文字目から4文字分を指定
var result = str.substr( 0, 4 );
 
console.log( result );