Recursive thinking to obtain all tag elements on the page (remove duplication)

This article shares with you the code that uses recursive thinking to obtain all tag elements on the page. Friends in need can refer to this code

var tag = [];
var search = function($element, tag){
  var localName = $element[0].localName;
  if(!tag.includes(localName)){
    tag.push($element[0].localName);
  }
  var children = $element.children();
  if(children.length > 0) {
    children.each(function(e){
      search($(this), tag);
    });
  }
  return tag;
};

tag = search($('html'), tag);
console.log(tag);

Use recursive thinking to traverse all elements and finally return an array

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