js 数组追加对象出错

Question

this.$store.state.playList.unshift({songname:this.$store.state.chosenList.songname,url:this.$store.state.songurl})

数据是没问题的 单独push 不是对象没错啊

this.$store.state.playList.unshift(this.$store.state.chosenList.songname)

               

                console.log( this.$store.state.playList)

但是这样追加进数组出错 为什么