css类名为undefined的情况，低端机webview中background-image属性不生效

![image](https://user-images.githubusercontent.com/21971405/185067420-1ec98f45-404c-4d39-90c9-5e655ad5d128.png)
![image](https://user-images.githubusercontent.com/21971405/185067507-03642db6-bc78-4f8d-8ef0-50e4e10ca901.png)
![image](https://user-images.githubusercontent.com/21971405/185067540-90de9da5-367f-4a6a-89b1-4a3c6f3b2bed.png)


**原因**

低端机webview识别不了十六进制颜色代码中的透明度段码，所以选用rgba代替八位进制码就可以解决问题
![image](https://user-images.githubusercontent.com/21971405/185067774-0b693fb4-ca15-48f2-8372-e23879956539.png)
![image](https://user-images.githubusercontent.com/21971405/185067809-976f6547-a505-40f6-997f-49c763e5daee.png)




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css类名为undefined的情况，低端机webview中background-image属性不生效 #17

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css类名为undefined的情况，低端机webview中background-image属性不生效 #17

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