React Koans 学习笔记

React的两个重要属性 props和state

• Properties - we pass these values when we create a component. They don't change during the component's lifecycle.
• State - these values can change over entire life of the component.When you change some value in state object, React will re-calculate the render method and update the HTML to match the new state (in this case, updating the class).

普通回显小技巧 如果在input中绑定onChange事件　event.target.value 就可以得到输入框的值