Cnpm usage error

  node.js, question
/usr/local/lib/node_modules/cnpm/node_modules/npminstall/bin/install.js:17
 const debug = require('debug')('npminstall:bin:install');
 ^^^^^
 SyntaxError: Use of const in strict mode.
 at exports.runInThisContext (vm.js:73:16)
 at Module._compile (module.js:443:25)
 at Object.Module._extensions..js (module.js:478:10)
 at Module.load (module.js:355:32)
 at Function.Module._load (module.js:310:12)
 at Function.Module.runMain (module.js:501:10)
 at startup (node.js:129:16)
 at node.js:814:3

What is the version of Node.js? Try upgrading to v4 or v5, or use it directly.npm i --registry=https://registry.npm.taobao.org