为什么getElementsByClassName不起作用? [英] Why isn't getElementsByClassName working?

问题描述

我不明白为什么getElementsByClassName在这里不起作用.

I can't understand why getElementsByClassName isn't working here.

  n = new Date();
  y = n.getFullYear();
  document.getElementByClassName("date").innerHTML = y;

<span class="date"></span> CompanyName

推荐答案

1. 函数名称为 getElementsByClassName ，而不是 getElementByClassName
2. getElementsByClassName 返回元素的数组形式对象，而不是元素之一.

1. The function name is getElementsByClassName, not getElementByClassName
2. getElementsByClassName returns an array-like object of elements, not the one of elements.

代码应如下所示:

n = new Date();
y = n.getFullYear();
document.getElementsByClassName("date")[0].innerHTML = y;

<span class="date"></span> CompanyName

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