这个问题是因为抄了站内utf-8终端兼容导致的，具体来说，在settings.json中存在：

"terminal.integrated.profiles.windows": {
        "PowerShell": {
            "source": "PowerShell",
            "icon": "terminal-powershell",
            "args": ["-NoExit","chcp 936"]
        },
        "Command Prompt": {
            "path": [
                "${env:windir}\\Sysnative\\cmd.exe",
                "${env:windir}\\System32\\cmd.exe"
            ],
            "args": ["\K","chcp 936"],
            "icon": "terminal-cmd"
        },
        "Git Bash": {
            "source": "Git Bash"
        },
        "Windows PowerShell": {
            "path": "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe"
        }
    },

问题就出在这个\K上，去掉即可。