Bootstrap popover 实现鼠标移入移除显示隐藏功能方

var strContent = '<div class="media"><div class="position-left media-left"><img class="img-circle" src="/assets/images/avatar.jpg">'+
         '</div>'+
         '<div class="media-body">'+
          '<h4 class="media-title">小标题</h4>'+
          '<p><strong>张三</strong> <span class="label label-primary">管理员</span></p>'+
         '</div>'+
         '</div>';
$( 'li#user_avatar' ).popover({
  trigger:'manual',
	placement:'bottom',
	html:true,
	container:'#bs-example-navbar-collapse-1',
	content:strContent,
}).on( 'mouseenter', function(){ 
  var _this = this; 
  $(this).popover( 'show' ); 
  $(this).siblings( '.popover' ).on( 'mouseleave' , function () { 
    $(_this).popover( 'hide' ); 
  }); 
}).on( 'mouseleave', function(){ 
  var _this = this; 
  setTimeout(function () { 
    if (!$( '.popover:hover' ).length) { 
      $(_this).popover( 'hide' ) 
    }
  }, 100); 
});