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ctrl + shift + p选择Preferences: Open User Settings (JSON)

加上"editor.renderWhitespace": "all"

{
    "cmake.configureOnOpen": true,
    "files.encoding": "gb2312",
    "editor.fontVariations": false,
    "editor.fontSize": 15,
    "files.eol": "\n",
    "C_Cpp.default.systemIncludePath": [
        "\"D:/code/header\"",
        "\"D:/code/include\""
    ],
    "C_Cpp.default.browse.path": [],
    "editor.renderWhitespace": "all"
}

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