ExtJs。如何在网格列标题中添加项目？(以现代为主题)

Ext.create('Ext.grid.Panel', {
    title: '示例网格',
    store: Ext.create('Ext.data.Store', {
        fields: ['name', 'email', 'phone'],
        data: [
            { name: 'John', email: 'john@example.com', phone: '555-111-1111' },
            { name: 'Jane', email: 'jane@example.com', phone: '555-222-2222' },
            { name: 'Bob', email: 'bob@example.com', phone: '555-333-3333' }
        ]
    }),
    columns: [
        { header: '<div class="project">项目1</div>', dataIndex: 'name' },
        { header: '<div class="project">项目2</div>', dataIndex: 'email' },
        { header: '<div class="project">项目3</div>', dataIndex: 'phone' }
    ],
    renderTo: Ext.getBody()
});