How does the background image in the WeChat applet fill the entire screen and stretch

no deformation

1. In the wxss file of the page, set the style of the background image:

page{
    background-image: url(图片路径);
    background-size: 100% 100%;
    background-repeat: no-repeat;
}

2. In the json file of the page, set the style of the background image:

{
  "backgroundTextStyle": "dark",
  "backgroundColor": "#ffffff",
  "backgroundImage": "图片路径",
  "backgroundSize": "100% 100%"
}