# JSX and JavaScript
## Introduction
JSX (JavaScript XML) is an extension to JavaScript that allows you to write HTML-like code directly in your JavaScript files. It is mainly used in React, a popul
When writing React component tests, it can be hard to decipher the error diffs of broken tests, since they are just the final objects that React uses ...
1、 如果需要渲染数据，应该使用数组的map()方法。map()的意思是映射。2、渲染列表的时应该添加key属性，key属性的值要保证唯一。3、map()遍历谁，就给谁添加key属性。4、添加key值的时候，尽量避免索引号作为key，(以为还有可能删除和插入，如果使用索引号就凉凉了)// 循环渲染const song山南'}]const ul
