js拾遗--map

const lesson = {
    name: "课程",
    lessons: ["js", "ts", "vue"],
    show() {
        return this.lessons.map(function (lesson) {
            return this.name + "-" + lesson
        }, this)
    },
}
console.log(lesson.show())

const lesson = {
    name: "课程",
    lessons: ["js", "ts", "vue"],
    show() {
        return this.lessons.map(lesson => this.name + "-" + lesson)
    },
}
console.log(lesson.show())