ExtJs日期datefield控件设置默认值

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<p><span style="background-color:rgb(255,0,0)">如果是extjs4</span></p>
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<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Helvetica,Tahoma,Arial,sans-serif; line-height:25.1875px"> datefield日期控件设置默认值，为当天的前一月，和后一月</p>
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<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Helvetica,Tahoma,Arial,sans-serif; line-height:25.1875px"> Ext.Date.MONTH    月<br> </p>
<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Helvetica,Tahoma,Arial,sans-serif; line-height:25.1875px"> Ext.Date.YEAR       年</p>
<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Helvetica,Tahoma,Arial,sans-serif; line-height:25.1875px"> Ext.Date.DAY          天</p>
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