谁会在extjs中设置field与field之间的间距？

Question

var simple = Ext.create('Ext.form.Panel', {
        //url:'save-form.php',
        frame:true,
        title: '个人信息确认',
        bodyStyle:'padding:5px 40px 0',
        width: 950,
        height:350,
        fieldDefaults: {
            msgTarget: 'side',
            labelWidth: 120
        },
        defaultType: 'textfield',
//        defaults: {
//            anchor: '60%'
//        },        items: [{
            fieldLabel: '姓&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp名',
            labelWidth:120,
            width:375,
            labelAlign:'left',
//            labelStyle:'width:100;',
            name: 'name',
            allowBlank:false
        },new Ext.form.NumberField({
//xtype:'numberfield',
nanText:'请输入有效整数',
width:375,
minValue:'1',
hideTrigger: true,
allowNegative:false,
allowDecimals:false,
allowBlank:false,
            fieldLabel: '身份证号码',
            name: 'id'
        }),new Ext.form.NumberField({
//xtype:'numberfield',
nanText:'请输入有效整数',
minValue:'1',
width:375,
allowBlank:false,
hideTrigger: true,
allowNegative:false,
allowDecimals:false,
            fieldLabel: '手&nbsp机&nbsp号&nbsp码',
            name: 'phoneNum'
        }),{
            //xtype: 'timefield',
            fieldLabel: '短信验证码',
            width:375,
allowBlank:false,
            name: 'message',
        },new Ext.Button({
//xtype:'button',
width:70,
text:'点击获取',
})],        buttons: [{
            text: '确认提交',
handler: function(){
                this.up('form').getForm().submit({
                    url: 'xml-form-errors.xml',
                    submitEmptyText: false,
                    waitMsg: 'Saving Data...'
                });
            }
        }]
    });
field与field之间的间距如何设置？