js通过提交过来的表单获取表单中的指定数据

js代码：

function getSelectedAttributes(formBuy)

{

  var spec_arr = new Array();

  var j = 0;

  for (i = 0; i < formBuy.elements.length; i ++ )

  {

    var prefix = formBuy.elements[i].name.substr(0, 5);

    if (prefix == 'spec_' && (

      ((formBuy.elements[i].type == 'radio' || formBuy.elements[i].type == 'checkbox') && formBuy.elements[i].checked) ||

      formBuy.elements[i].tagName == 'SELECT'))

    {

      spec_arr[j] = formBuy.elements[i].value;

      j++ ;

    }

  }

  return spec_arr;

}

调用：getSelectedAttributes(document.forms[‘formname’])