how to write infinite in for loop in javascript code example

Example 1: javascript infinite loop

while (true) {
    //your code
}

Example 2: javascript infinite for loop

var userInput;
		   var more;
		   
           userInput=prompt("Select number from 0 to 9","")
		   userInput=parseInt(userInput);
		  

		  for (index=userInput;index < 0;index>9 ) {
	document.write("Not in range");
	
	
}
document.write("Not in range");