## 自定义页脚

使用footer可以自定义页脚的内容

```json
{
    "body": [{
        "type": "container",
        "model": "footerDemo",
        "children": [{
            "type": "modal",
            "name": "footermodal",
            "footer": [{
                "type": "text",
                "text": "footer text"
            }],
            "children": [
                {
                    "type": "text",
                    "text": "this is demo"
                }
            ]
        }, {
            "type": "button",
            "text": "点击出弹框",
            "trigger": [{
                "event": "onClick",
                "targetCustomer": "$this",
                "params": {
                    "footermodal": true
                }
            }]
        }]
    }]
}
```