JSFiddle - React, Tailwind, and code Playground

by Geo Morillo

HTML

<span data-bind="text:test1"></span>

JavaScript

var viewModel = function() {
    var self =  this;
    this.item1 = ko.observable("this.item1");
    
    self.test1 = ko.observable();
   
    
    
    self.testfunction = function(){
        self.test1(self.item1());
    };

   };
ko.applyBindings(new viewModel);