server/www/dom.js

function Dom() {
  return {
    clear: clear,
    make: make
  }

  function clear(elem) {
    while(elem.firstChild) {
      elem.removeChild(elem.firstChild);
    }
  }

  function make(tag, properties) {
    var e = document.createElement(tag);
    for(key in properties) {
      var value = properties[key];
      switch(key) {
        case "class":
          e.className = Array.isArray(value) ? value.join(' ') : value;
          break;;
        case "onClick":
          e.addEventListener("click", value);
          break;;
        default:
          e[key] = value;
      }
    }
    return e;
  }

}