// 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.querySelector(".c-red.c-green").children;

// 选择<p>Haskell</p>:
var haskell = document.querySelector(".c-green:last-child :last-child");