<form id="add_viewpoint_form" onsubmit="return checkAdd(this);" action="/member/xingcheng4.jspx" method="post"><span class="tb1"><input type="text" name="viewpoint"/>
onsubmit="return checkAdd(this);" 必须要有return
<form id="add_viewpoint_form" onsubmit="return checkAdd(this);" action="/member/xingcheng4.jspx" method="post"><span class="tb1"><input type="text" name="viewpoint"/>
onsubmit="return checkAdd(this);" 必须要有return