// 选择<p>JavaScript</p>:
var js = document.getElementById('test-p');
// 选择<p>Python</p>,<p>Ruby</p>,<p>Swift</p>:
var arr = document.querySelectorAll('.c-red.c-green p');
// 选择<p>Haskell</p>:
var haskell = document.querySelector('.c-green:not(.c-red)').lastElementChild;
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Fireflywsm
// 选择<p>JavaScript</p>:
var js = document.getElementById('test-p');
// 选择<p>Python</p>,<p>Ruby</p>,<p>Swift</p>:
var arr = document.querySelectorAll('.c-red.c-green p');
// 选择<p>Haskell</p>:
var haskell = document.querySelector('.c-green:not(.c-red)').lastElementChild;