誤り
if ($(hoge).hasClass('.foobar')) {
}
if ($(hoge).is('foobar')) {
}
正しい
if ($(hoge).hasClass('foobar')) {
}
if ($(hoge).is('.foobar')) {
}
冷静に考えれば当たり前の話ですが、普段セレクタ書いてること多いと $(hoge).hasClass('.foobar') は特にやりがち。
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