Umgang mit mehreren Absenden-Schaltflächen im selben Formular

 //前端代码
< form method ="POST" onsubmit ="return ad.checkform(this);return false;" >
       ......
       ......
    <a href="javascript:void(0);" onclick="this.parentNode.submit();">
       < input type ="submit" onclick ="this.form.target='_blank'" name ="preview" value =" 预 览 " >
       < input type ="submit" onclick ="this.form.target='_self'" name ="save" value =" 保 存 " >
</ Formular >