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jQuery関数への第二パラメータとしてコンテキスト参照を渡す

More than 3 years have passed since last update.

以下参照

jquery.js
// <p>要素から見つかった<em>ワードの合計数を出力する
window.alert($('p').find('em').length + ' italic words');

// 以下コンテキスト参照で上記コードと等価
window.alert($('em', $('p')).length + ' italic words');
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