iview组件的Table表格的内容过多时，显示title提示

render: (h, params) => {
            let roleTitle=params.row.roleTitle
            return h('div', [
              h('span', {
                  style: {
                      display: 'inline-block',
                      width: '100%',
                      overflow: 'hidden',
                      textOverflow: 'ellipsis',
                      whiteSpace: 'nowrap'
                  },
                  domProps: {
                      title: roleTitle
                  }
              }, roleTitle)
            ])
          }