sencha-touch-1.1-selectfield(combobox)如何设置默认选项

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1.将value为grid的option设置为默认项

Ext.getCmp('viewPortSelect').setValue('grid');

2.从controller覆盖原有option

Ext.getCmp('theSelect').setOptions([   {text: 'First Option',  value: 'first'},    {text: 'Second Option', value: 'second'},    {text: 'Third Option',  value: 'third'}]);

参考：http://stackoverflow.com/questions/7595669/how-to-make-the-default-text-in-a-select-field-grey-like-the-placeholder-for-tex