//遍歷所有FORM
  for(formsNum=0; formsNum<window.document.forms.length; formsNum++) ...{
    //遍歷FORM中的所有ELEMENT
    for(elementsNum=0; elementsNum<window.document.forms[formsNum].elements.length; elementsNum++)   {
        if(window.document.forms[formsNum].elements[elementsNum].type == "text") ...{
          window.document.forms[formsNum].elements[elementsNum].value = "";
        }
      }
  }
}