vscode提示快捷键是Ctrl + space（空格 ），但是Ctrl + space是系统输入法切换快捷键，这样就会有冲突
在vscode中按Ctrl + Shift + P 输入key命令keyboard将以下JSON复制进入

// Place your key bindings in this file to override the defaultsauto[]
[
    {
        "key": "alt+oem_2",
        "command": "editor.action.triggerSuggest",
        "when": "editorHasCompletionItemProvider && textInputFocus && !editorReadonly"
    },
    {
        "key": "ctrl+space",
        "command": "-editor.action.triggerSuggest",
        "when": "editorHasCompletionItemProvider && textInputFocus && !editorReadonly"
    }
]

将快捷键重新设置后可以使用Alt + /和Ctrl + I代码提示建议