回答編集履歴
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補足の追加。
answer
CHANGED
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@@ -20,4 +20,20 @@
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【jQueryで全選択・全解除はprop使う - Qiita】
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[http://qiita.com/ituki_b/items/17eab8c38a2ad5392660](http://qiita.com/ituki_b/items/17eab8c38a2ad5392660)
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[http://qiita.com/ituki_b/items/17eab8c38a2ad5392660](http://qiita.com/ituki_b/items/17eab8c38a2ad5392660)
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---
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**追記：**
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少し改良。
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```JavaScript
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$( _=> {
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const $_btn = $( '#btn' ), $_check = $( '[id^="check"]' ).prop( 'checked', false );
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$_check.on( 'change', _=> {
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const ck = $_check.length === $_check.filter( ':checked' ).length;
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$_btn.prop( 'disabled', !ck )[ ck ? 'removeClass' : 'addClass' ]( 'inactive' );
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} ).change();
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} );
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```**動くサンプル：**[https://jsfiddle.net/j5w2atvb/1/](https://jsfiddle.net/j5w2atvb/1/)
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