问SyntaxError: Unexpected token >？

[root@VM-9-12-centos www]# node index.js

/root/www/index.js:6
app.get('/', (req, res) => {
                         ^
SyntaxError: Unexpected token >
    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 Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:945:3