1.在插件里下载background插件

2.选择扩展设置

3.选择在setting.json中设置

 4.插入代码

"workbench.iconTheme": "vs-minimal",
    "workbench.productIconTheme": "vscode-v1-icons",
    "liveServer.settings.donotShowInfoMsg": true,
    "update.enableWindowsBackgroundUpdates": true,
    "background.customImages": [

        "https://www.acgtubao.com/wp-content/uploads/2020/01/67624284_p0.jpg"//背景地址，可以用网络地址
    ],
    "background.style": {
        "content":"''",
        "pointer-events":"none",
        "position":"absolute",
        "width":"100%",
        "height":"100%",
        "z-index":"99999",
        "background.repeat":"no-repeat",
        "background-size":"100%,100%",
        "opacity":0.2//背景透明度
    },

第二种：可以直接用插件background-cover设置了