需要以下插件

在设置中搜索setting,点击

添加如下代码

 "backgroundCover.opacity": null,
    "background.enabled": true,
    "background.useDefault": false,
    "background.customImages": [
    "file:///E:/background-angel.png"
    ],
    "background.style": {
    "content": "''",
    "pointer-events": "none",
    "position": "absolute",
    "z-index": "99999",
    "width":"100%",
    "height":"100%",
    "background-position": "top",
    "background-repeat": "repeat",
    // "background-size":"100%,100%",
    "background-size":"cover",
    "opacity": 0.2
    },