Why isn't getElementsByClassName working?

问题

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

回答1:

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

Code should look like this:

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

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

来源：https://stackoverflow.com/questions/56534225/why-isnt-getelementsbyclassname-working