在Ext的GridPanel中添加鼠标悬停的效果

			{
				header : "备注",
				sortable : true,
				dataIndex : 'fzr_bz',
				width : 3,
				renderer: function(value, metadata, record, rowIndex, columnIndex, store) {  
	                metadata.attr = 'ext:qtip="' + value +'"';  
	                return value;  
	               }  
				
			}

资料来源： http://blog.youkuaiyun.com/gaojiayuan/article/details/7898589