Javascript - 对象中的变量

如何解决Javascript - 对象中的变量

鉴于我有以下脚本，如何在对象中附加/使用变量 portVal，即 "investment_value": portVal

  var portVal = 100000
  setTimeout(invalidForm,2000);
    function invalidForm() {
      utag.link({
          "event_name": "invalid form submission","investment_value": portVal,"page_title": "Calculator - Invalid form submission","error_message": "Mandatory fields","language":   "en","country":    "Test","segment":    "Test","sub_segment":"Test"
      });
  }

我如何console.log该对象的investment_value？