更改快捷键方法如下:
1.选File/Pref/Keyboard Shortcuts
 
2. 左侧用ctrl+F找Ctrl+space,复制设定到右边 
改成:
[
{ "key": "alt+s",            "command": "editor.action.triggerSuggest",
                                     "when": 
"editorHasCompletionItemProvider && editorTextFocus && 
!editorReadonly" },
]
