js中如何往对象中添加属性_javascript技巧_

let obj = {'a':123};

let obj1 = {'c':1,'d':2};

let twoobj = Object.assign(obj1,obj); //两个注意的点： //用一个新的名称来接受Object.assign的值；不要用obj1来接受，会报错 //第一个参数是原来的对象，第二个是要添加进去的对象；

this.videoList = [] const data = await this.$http.post('Course/shows', { type: nedCuriculums.type, grade: nedCuriculums.grade, classtype: nedCuriculums.classtype, subject: nedCuriculums.subject, term: term }).catch(err => err) this.term = term var videoList = data.data ----------------------------------------------------------- // 假如数据是这样： videoList = [ { id: 1 type: "同步课程", grade: "一年级", classtype: "xxx", subject: "数学", term: "上" }， { id: 2 type: "同步课程", grade: "一年级", classtype: "xxx", subject: "数学", term: "上" } ] 

// 第一种方法，给对象动态添加属性 for of 根据对象 var newvideoList = {} for (var item of videoList) { newvideoList = { isHover: false, dirname: item.dirname, id: item.id, resourceId: item.resourceId } this.videoList.push(newvideoList) } 

// 第2种方法 for in 根据下标 for (var index in videoList) { videoList[index].isHover = false this.videoList.push(videoList[index]) console.log(index) this.videoList.push(videoList[index]) }