After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：JavaScript functions and function expressions: repeatable code
函数其实就是可重复执行的代码
2020-02-140个赞
变量是有作用域的，函数中可访问外部的变量!
凡是用var创建的变量都是局部变量，推荐此变量创建方法！
2020-02-140个赞
面向对象是一种编程方法
2020-02-140个赞
var obj = {} 创建对象！
2020-02-140个赞
Courses in the relevant section：for-in loop: a tool for traversing objects and arrays
for ( in ) 可遍历对象也可以遍历数组
2020-02-140个赞
