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一、3W1H
什么是3W1H呢?他们分别是 What、 Why、 Where、How
1.1:What:jQuery是什么?
jQuery是一个快速的、简洁的JavaScript框架,简单来说就是JavaScript的一个类库,里面封装了很多常用的功能代码。
1.2:Why:为什么使用jQuery?
jQuery的设计宗旨是“Write Less Do
More”,既提倡写更少的代码,做更多的事!所以我们使用jQuery会使我们的代码简便快捷更加适用于我们开发。
1.3:Where:jQuery什么时候用?
1.3.1中大型网站的开发。
1.3.2是一些前端框架的基础,比如说EasyUI、Bootstrap。
1.4:How:jQuery怎么使用?
案例1:对比js和jQuery
案例2.1基本选择器
标签选择器
类选择器
id选择器
案例2.2层次选择器
案例2.3过滤选择器
找到第一个:first
找到最后一个:last
偶数下标:even
奇数下标:odd
小于:gt
大于:lt
介于:用lt()和gt()的组合
案例5
表格换色
代码展示
2.4表单选择器
checked:单选框 复选框 让其选中
select 给下拉框赋值
底层代码展示