js remove all child elements from html

while (myNode.firstChild) {
  myNode.removeChild(myNode.lastChild);
}

// Get the <ul> element with id="myList"
let list = document.getElementById("myList");

// As long as <ul> has a child node, remove it
while (list.hasChildNodes()) {  
  list.removeChild(list.firstChild);
}

var myDiv = document.getElementById("myDivID");
    myDiv.innerHTML = "";//remove all child elements inside of myDiv

document.getElementById("myId").innerHTML = '';