Function createObj

static/js/codemirror/codemirror.js:4959–4965

(base, props)

  }

  function createObj(base, props) {
    function Obj() {}
    Obj.prototype = base;
    var inst = new Obj();
    if (props) copyObj(props, inst);
    return inst;
  }

  function copyObj(obj, target) {
    if (!target) target = {};