Process JS in your html

JSlnline.js

function processJSin(target) {
  var html = target.innerHTML;
    var temp = html.match(/\{\{.*\}\}/);
    if (temp !== null) {
      temp.forEach(function(item){
        var e = item.replace("{{","").replace("}}","");
        html = html.replace(item,eval(e));
      });
      target.innerHTML = html;
    }
}

processJSin(document.body);