JSFiddle - React, Tailwind, and code Playground

Удвоение свойств объекта, содержащих число.

by LeD4eG

HTML

<html>
<head>
  <title>Simple func</title>            
</head>
<body>
    <div id="block">
        <span>bla</span>
        <span>bla</span>
        <span>bla</span>
     </div>
</body>
</html>

JavaScript

var childs = document.getElementById('block').childNodes,
    counter = 0; 
alert(childs.length);

for(var i = 0; i<childs.length; i++){
   var mythis = childs[i];
   if(mythis.nodeType==3) mythis.parentNode.removeChild(mythis); 
  // ++counter;
}
    
alert(childs.length);

var newElem = document.createElement("p"),
    newText = document.createTextNode('bla-bla-bla');
newElem.appendChild(newText);

document.getElementById('block').insertBefore(newElem, document.getElementById('block').firstChild);