使用jQuery插件qtip遇到的位置有关问题

$("#myQtip").qtip({
		id: 'testTip',
		content: {
			text:' ',
			title: {text: "信息",button:true}
		},
		position: {
			target: 'event', 
			effect: true,
			container : $(self.el),
			at: 'top left',
			my: "left center",
			viewport: $(window),
			method: 'shift none',
			adjust: {x: 250}
		},
		show: {
			event: 'click',
			target: elems
		},
		events: {
        	render: function(event, api) {},
		show: function(event, api) {}
		}
});