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为什么都是undefinded

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Pider_李

#1 Created at ... [Delete] [Delete and Lock User] 
// 选择<p>JavaScript</p>:
var js = document.getElementById('test-p');
alert(js.innerText);

// 选择<p>Python</p>,<p>Ruby</p>,<p>Swift</p>:
var arr = document.getElementsByClassName('c-red');
alert(arr[0].innerText);
// 选择<p>Haskell</p>:
var haskell = document.getElementsByClassName('c-green').lastElementChild;

亲问老师，为什么都是Undefined

廖雪峰

#2 Created at ... [Delete] [Delete and Lock User]

改成innerHTML

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