JSFiddle - React, Tailwind, and code Playground

HTML

<form name="form1" id="form1">
   ...
   <label><input type="radio" name="radio1" value="0" checked/>Нет</label>
   <label><input type="radio" name="radio1" value="1"/>Да</label>
  
   <input type="text" value="100" name="input1"  disabled/>
   ...
</form>

JavaScript

form1.onchange = function(e){
      if(e.target.name == "radio1"){
         form1.elements.input1.disabled = !+e.target.value;
      }
}