yuijam

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import React, { Component } from 'react'

export default class index extends Component {
  render() {
    return (
      <div>
        Hello Next
      </div>
    )
  }
}

npm i react
npm i react-dom
# 让他支持es6
npm install babel-cli -g
npm install babel-preset-react -S
npm install babel-preset-env -S 
npm install babel-plugin-transform-decorators-legacy -S

npm install express --save
npm install --save-dev cross-env  # 跨平台设置环境变量
npm install -g nodemon  # 监视文件的改变并重新运行命令

function TreeNode(val) {
  this.val = val;
  this.left = this.right = null;
}

var myPow = function(x, n) {
  if (n < 0){
    x = 1 / x
    n = -n
  }
  if (n === 1) return x;
  return x * myPow(x, n-1)
};

let name='kobe'
let age=19;
console.log(${name}'s age = ${age});   //kobe's age = 19