columns1: [
              {
                   title: 'Name',
                   key: 'name'
               },
               {
                   title: 'Age',
                   key: 'age'
               },
               {
                   title: 'Address',
                   key: 'address',
                   render: (h,params) =>{
                   let text = params.address;
						return h('div',[
							h('tooltip',{
								props:{placement:'top'}
							},[
								h('span',{
									display:'inline-block',
									width:'80px',
									overflow:'hidden',
									textOverflow:'ellipsis',
									whiteSpace:'nowrap'
								},text),
								h('span',{
									slot:'content',
									style:{whiteSpace:'normal',wordBreak:'break-all'}
								},text)
							])
						])
				  }
               }
           ]