超链接 Form提交前 脚本验证

<a href="javascript:void(document.forms[0].submit())" onclick="return SaveData()" value="test">


    if(checkAll()==0 && checkLineBaseInfo() == 0)
    {
        if(document.getElementById('hidFreightId').value != null &&       document.getElementById('hidFreightId').value != '')
        {
           document.forms[0].action = 'update.rails'
        }
        else
        {
           document.forms[0].action = 'create.rails'
        }      
        return true;
    }
    else
    {
        return false;
    }