在React引用同物件裡面的其他函數時，記得加上this.

像這則例子，

var React = require('react');
var ReactDOM = require('react-dom');
var Child = require('./Child');

var Parent = React.createClass({
  getInitialState: function () {
    return { name: 'Frarthur' };
  },

  changeName: function (newName) {
    this.setState({
      name: newName
    });
  },

  render: function () {
    return (
    <Child
    name={this.state.name}
        onChange={this.changeName} />
    );
  }
});

//因為需要定義作用中function，所以一定要記得加上this啊～～

ReactDOM.render(
<Parent />,
document.getElementById('app')
);

基本Python寫法：超市算術

＃首先我們給個list

shopping_list = ["banana", "orange", "apple"]

＃定義Dictionary

stock = {
    "banana": 6,
    "apple": 0,
    "orange": 32,
    "pear": 15
}
   
prices = {
    "banana": 4,
    "apple": 2,
    "orange": 1.5,
    "pear": 3
}

# 定義函數，裡面有個變數food，然後利用條件式，如果有庫存就加進總計，庫存減一

def compute_bill(food):
    total= 0
    for number in food:
        if stock[number] > 0:
            total += prices[number]
            stock[number] -= 1
    return total