javascript - Why is setting the dipplay of a tag invalid in JS but valid in CSS?

Question

Answer 1

box.getElementsByTagName('a')[0]

Answer 2

txt[0].style.display = 'none';

Answer 3

You wrote txt[0].style.color = '#f00' If it works
Then you wrote txt.style.display = 'none' Don’t you feel awkward?

Answer 4

document.getElementsByTagName('a')[0].style.display = "none";

What is set using getElementsByTagName is an array, so the value needs to be indexed

Answer 5

getElementsByTagName is obtained from NodeList. You need to use subscripts to obtain a specific element. The txt you use is a nodelist, which is a list of multiple elements. Please refer to https://developer.mozilla.org...