小编Moh*_*ghi的帖子

我想更改 Material UI Slider 组件颜色

我曾尝试更改 CSS 样式但它不起作用，然后我尝试了此问题中给出的解决方案并应用了此代码但它不起作用

getMui主题：

const muiTheme = getMuiTheme({
  slider: {
    trackColor: "yellow",
    selectionColor: "green"
  }
});

并在组件中：

<MuiThemeProvider muiTheme={muiTheme}>
     <Slider
         min={18}
         max={90}
         ValueLabelComponent={ValueLabelComponent} 
         defaultValue={40}
     />
</MuiThemeProvider>

我已经使用 ClearDb mysql 在heroku 上部署了一个nodejs 应用程序，该应用程序工作了一会儿然后崩溃了。我检查了日志并得到了这个错误

2019-09-20T19:03:41.536452+00:00 app[web.1]: events.js:174
2019-09-20T19:03:41.536474+00:00 app[web.1]: throw er; // Unhandled 'error' event
2019-09-20T19:03:41.536476+00:00 app[web.1]: ^
2019-09-20T19:03:41.536478+00:00 app[web.1]:
2019-09-20T19:03:41.536481+00:00 app[web.1]: Error: Connection lost: The server closed the connection.
2019-09-20T19:03:41.536483+00:00 app[web.1]: at Protocol.end (/app/node_modules/mysql/lib/protocol/Protocol.js:112:13)
2019-09-20T19:03:41.536485+00:00 app[web.1]: at Socket.<anonymous> (/app/node_modules/mysql/lib/Connection.js:97:28)
2019-09-20T19:03:41.536488+00:00 app[web.1]: at Socket.<anonymous> (/app/node_modules/mysql/lib/Connection.js:525:10)
2019-09-20T19:03:41.53649+00:00 app[web.1]: at Socket.emit (events.js:203:15)
2019-09-20T19:03:41.536492+00:00 app[web.1]: at endReadableNT (_stream_readable.js:1145:12)
2019-09-20T19:03:41.536495+00:00 app[web.1]: at process._tickCallback (internal/process/next_tick.js:63:19)
2019-09-20T19:03:41.536497+00:00 app[web.1]: Emitted 'error' event at:
2019-09-20T19:03:41.536503+00:00 app[web.1]: at Connection._handleProtocolError (/app/node_modules/mysql/lib/Connection.js:426:8)
2019-09-20T19:03:41.536506+00:00 app[web.1]: at Protocol.emit (events.js:198:13)
2019-09-20T19:03:41.536509+00:00 app[web.1]: …