使用js创建select option

  var v_select = document.getElementById("selectA");
  var v_option = document.createElement("OPTION");
  v_select.options.add(v_option);
  v_option.innerHTML="name";
  v_option.value = "1";
  
  var v_option2 = document.createElement("OPTION");
  v_select.options.add(v_option2);
  v_option2.innerHTML="name2";
  v_option2.value = "2";

要点是:

先v_select.options.add()

然后再设置v_option.value值