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。