javascript 在developer.mozilla.org的顶部添加了一个新元素

Posted 2021-05-03

// add a new span element to top of mdn

var new_header = document.createElement("span")

var new_header_content = document.createTextNode("new replacement span element") 

new_header.appendChild(new_header_content)

var header = document.getElementById('main-header')

var parentDiv = header.parentNode

parentDiv.replaceChild(new_header, header) 

// to remove it 

let node = document.getElementById('main-header')

if (node.parentNode) { 
  node.parentNode.removeChild(node)
}