看下这个弹出窗口中写的函数或许你就明白了：
function goIt(obj_id,obj_name)
{
window.opener.document.forms["myForm"].elements["form_plant_shu"].value = obj_name;
window.opener.document.forms["myForm"].elements["form_plant_shu"].style.background = "white";
window.close();
return false;
}
