MaxInterview - appendchild element once if element present in js

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1 <script>
2       var button = false;
3        function  myfun(){
4            if ( button === false){
5                var b1 = document.createElement("BUTTON");
6                b1.innerHTML = "Click Me";
7                document.body.appendChild(b1); 
8                return button = true;  
9            }
10      }
11    </script>
12<p id="demo" onclick="myfun();"> click me to create button </p>

1parentElement.insertBefore(newElement, parentElement.children[2]);
2

1 <script>
2       var button = false;
3        function  myfun(){
4            if ( button === false){
5                var b1 = document.createElement("BUTTON");
6                b1.innerHTML = "Click Me";
7                document.body.appendChild(b1); 
8                return button = true;  
9            }
10      }
11    </script>

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