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作业

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 // 选择<p>JavaScript</p>:

        var js = document.querySelector('#test-p');

        // 选择<p>Python</p>,<p>Ruby</p>,<p>Swift</p>:

        var arr = document.getElementsByClassName('c-red c-green')[0].getElementsByTagName('p')

        // 选择<p>Haskell</p>:

        var haskell = document.getElementsByClassName('c-green')[1].lastElementChild;


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