如果你是mac用户，code--首选项--设置，进入后和window不太一样，mac展示的是一个列表：
你可以自己搜索includeLanguages
然后进入到用户设置，点击settings.json中编辑，进入到新画面
把这段话加上去就可以了
"emmet.includeLanguages": {
"javascript": "javascriptreact"
}
以下是我的settings设置代码：
{
"workbench.colorTheme": "Monokai",
"editor.fontSize": 16,
"editor.formatOnType": true,
"explorer.confirmDragAndDrop": false,
"[javascript]": {
"editor.defaultFormatter": "vscode.typescript-language-features"
},
"prettier.singleQuote": true,
"prettier.semi": false,
"prettier.jsxSingleQuote": true,
"vetur.format.defaultFormatter.js": "vscode-typescript",
"editor.formatOnSave": true,
"emmet.includeLanguages": {
"javascript": "javascriptreact"
}
}