摘要：对象 let obj = { user: { name: "zhang", age: 20, school: { name: "清华", class: 3, grader: 1 } } } 例：获取 obj.user.school.name 首先使用 split，转为数组 然后使用 shift() 阅读全文

摘要：<div id="app"> <header> <span style="font-size: 22px;">&lt;</span> <h3 style="display: inline-block;">helloWorld</h3> </header> <p>hello</p> <button t 阅读全文