//子菜单鼠标获得焦点
function MM_over(mmObj) {
console.log(mmObj)
var $mmObj=$(mmObj);
$mmObj.css("position","relative");
var $mSubObj= $mmObj.children().first();
var $td=$mSubObj.parent().parent();
if( $td.children().length=='3'){
$mSubObj.attr("style","left:-65px;");
}
$mSubObj.show();
}
//菜单鼠标失去焦点
function MM_out(mmObj) {
var $mmObj=$(mmObj);
var $mSubObj= $mmObj.children().first();
$mSubObj.hide();
$mmObj.css("position","");
}