多个提交按钮在同一表单内的处理方式

 // 补充代码
<表单方法="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" >
</表格>