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JS determines whether the numeric string contains characters

2022-04-23 04:46:00 【spring-java】 

function isLetter(str) {
    for (var i in str) {
        var asc = str.charCodeAt(i);
        if ((asc >= 65 && asc <= 90 || asc >= 97 && asc <= 122)) {
            return true;
        }
    }
    return false;
}

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