Ext formPanel 中numberfield 输入框 火狐不能输入

Question

{layout:"column",width:1300,items:[
{columnWidth:.11,layout:"form",items:[
{xtype:"numberfield",id:"totalfeeStart",
fieldLabel:"订单金额", 
      nanText:"请输入订单总额", //无效数字提示
     allowNegative:false ,  //不允许输入负数
width:60,
validator:checktotalfee
}
]},
{columnWidth:.1,layout:"form",labelWidth:20,items:[
{xtype:"numberfield",id:"totalfeeEnd",
fieldLabel:"至", 
      nanText:"请输入订单总额", //无效数字提示
     allowNegative:false ,  //不允许输入负数
width:60,
validator:checktotalfee
}
]},
{columnWidth:.17,layout:"form",items:[
{xtype:"datefield",id:"makerStartTime",validator:checkdate,altFormats: 'Y-m-d H:i:s',format:'Y-m-d H:i:s',fieldLabel:"下单时间",width:145}
]},
{columnWidth:.15,layout:"form",labelWidth:20,items:[
{xtype:"datefield",id:"makerEndTime",validator:checkdate,fieldLabel:"至",labelSeparator:' ',altFormats:'Y-m-d H:i:s',format:'Y-m-d H:i:s',width:145}
]
},
{columnWidth:.17,layout:"form",items:[
{xtype:"datefield",id:"paytimestart",validator:checkdate,altFormats: 'Y-m-d H:i:s',format:'Y-m-d H:i:s',fieldLabel:"支付时间",width:145}
]},
{columnWidth:.15,layout:"form",labelWidth:20,items:[
{xtype:"datefield",id:"paytimeend",validator:checkdate,fieldLabel:"至",labelSeparator:' ',altFormats:'Y-m-d H:i:s',format:'Y-m-d H:i:s',width:145}
]
}
]},