「JavaScript」includes() のサンプル

2020年10月13日

構文
arr.includes(valueToFind[, fromIndex])
valueToFind 検索する値です。
fromIndex この配列内で valueToFind を探し始める位置です。
JavaScriptコード

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var cftArr = [1, 2, 3];
console.log(cftArr.includes(2));
var test = ['1111', '2222', '3333'];
console.log(test.includes('1111'));
console.log(test.includes('xxx'));
var cftArr = [1, 2, 3]; console.log(cftArr.includes(2)); var test = ['1111', '2222', '3333']; console.log(test.includes('1111')); console.log(test.includes('xxx'));
var cftArr = [1, 2, 3];

console.log(cftArr.includes(2));

var test = ['1111', '2222', '3333'];

console.log(test.includes('1111'));

console.log(test.includes('xxx'));

実行結果
true
true
false

JavaScript

Posted by arkgame