After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Variables Assignment of variables and variable types
typeof X 检测变量类型
2019-03-160个赞
Courses in the relevant section：while loop and dowhile loop
while (条件表达式) {} 用于不知道循环次数，条件满足才执行循环。每次执行循环前 先判断条件是否成立!
2019-03-160个赞
Courses in the relevant section：How to operate attributes with jQuery (1)
hasClass()\removeAttr()移除属性\attr()返回被选中属性的值
2019-03-230个赞
Courses in the relevant section：JSON introduction and example demonstration
1.JSON是JS对象表示法； 2.JSON是独立的编程语言; 3.JSON本质上是字符串，是通过JS语法约束的字符串
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Courses in the relevant section：How to get elements through css selector?
querySelector('li')、querySelectorAll('.class') css选择器，前者返回一个元素，后者返回一个元素集合数组
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