as shown in the figure, you just want to achieve a fixed header.
my idea is to dynamically listen for the distance from the table to the top of the browser. If the distance is equal to zero, just position the header absolutely at the top.
but what is the way to dynamically monitor the distance from table to the top of the browser?
or is there any other good way to implement it?
handleScroll () {
// let top = document.querySelector('.editor-warpper')[0].offsetTop
let top = Offset(document.getElementById('scrolling-container')).top
let scrolltop = document.body.scrollTop | document.documentElement.scrollTop
// console.log(top, scrolltop)
const toolbar = document.querySelector('.ql-toolbar')
if (scrolltop > top) {
addClass(toolbar, 'fixedtop')
} else {
removeClass(toolbar, 'fixedtop')
}
} if https://developer.mozilla.org.
doesn't have a ladder
/ / rect is a DOMRect object with eight properties: left, top, right, bottom, x, y, width, height
var rect = obj.getBoundingClientRect ();
answer the question of your title:
the height from the top of the visual area + the scrolling height of the scroll bar = the height from the top of the document
gives you a reference
if elementui has a fixed header, don't bother to write 
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