option: {
selection: true,
column: [
{
label: '#',
type:'selection',
},{
label: '用户账号',
prop: 'usernum',
sortable:true,
search: true,
}, {
label: '用户姓名',
prop: 'username',
search: true,
}, {
label: '头像',
prop: 'avatar',
}]
}