location href、parent location href、top location href、window open实现页面跳转

如果D页面中有form的话,

<form>: form提交后D页面跳转

<form target="_blank">: form提交后弹出新页面

<form target="_parent">: form提交后C页面跳转

<form target="_top"> : form提交后A页面跳转