picker 加title
var picker = Ext.create('Ext.Picker', { useTitles: true, slots: [{ name: 'months', title: 'Months', data: [{ text: 'January', value: 0 }, { text: 'February', value: 1 }, { text: 'March', value: 2 }, { text: 'April', value: 3 }, { text: 'May', value: 4 }, { text: 'June', value: 5 }, { text: 'July', value: 6 }, { text: 'August', value: 7 }, { text: 'September', value: 8 }, { text: 'October', value: 9 }, { text: 'November', value: 10 }, { text: 'December', value: 11 }] // data }]});Ext.Viewport.add(picker);picker.show();