javascript - How to get the value of display in js? Or you can get it with vue@2.0

Question

It is best to use js to get the display value

Console shows nothing

This is the code

Answer 1

const displayVal = document.defaultView.getComputedStyle(element[, pseudoElt]).display;

getComputedStyle

Answer 2

I guess you want to get the expansion and contraction of the left menu?
If it is Vue, you don’t need to spend so much time manipulating DOM elements, right? Just define a data control to show and hide it