//前端代码
<form method="POST" onsubmit="return ad***eckform(this);return false;"> ...... ......
th***parentNode.submit();"> <input type="submit" onclick="th***form.target='_blank'" name="preview" value=" 预 览 " > <input type="submit" onclick="th***form.target='_self'" name="save" value=" 保 存 " > form>