page.json 配置
加 “app-plus”: {
“softinputMode”: “adjustResize”
}

	{"path": "pages/jxx/xx","style": {"navigationBarTitleText": "贺卡DIY","enablePullDownRefresh": false,"app-plus": {"softinputMode": "adjustResize"}}},

背景图不要设置成高100%，获取窗口高度给背景图高赋值。

<view class="bgbg" :style="{height: screenHeight == 0 ? '100%':screenHeight+'px'}"></view>

created() {this.screenHeight = uni.getSystemInfoSync().windowHeight; 
},

ok完美解决。