【示例】
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HTML
<h3>How to use addClass() method properly.</h3> <p>This paragraph's font-size is 8px.</p> <p>This paragraph's font-size is 24px.</p> <button>使用addClass()函数添加类</button>
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JS
$(document).ready(function(){ $("button").click(function(){ $('p').addClass(function(n){ return 'par_' + n; }); }); });