摘要： const promise = new Promise((resolve, reject) => { console.log(1); resolve(); console.log(2); }) promise.then(() => { console.log(3); }) console.log(4 阅读全文

摘要： 1.计算属性和侦听器 computed: { total() { return this.courses.length } }, watch: { courses: { immediate: true, handler(newValue, oldValue){ this.totalCount=new 阅读全文