SyntaxError: Use of const in strict mode.

[oliango]

D:\pj\SkyRTC-demo-master\node_modules\ws\index.js:9
const WebSocket = require('./lib/WebSocket');
^^^^^
SyntaxError: Use of const in strict mode.
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (D:\pj\SkyRTC-demo-master\node_modules\skyrtc\SkyRTC.js:1:85)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)

报错是什么问题

[Tchoumi]

test with this CLI: node --harmony app.js