微信小程序：数组拼接

一开始用concat进行拼接，总是不行，代码如下：

handleItemChange(e){
      console.log(e)  
      var itemList = e.detail.value
      itemList.forEach(item =>{
        var row = item.split(',')
        var list = []
        const obj = {name: row[1],value: row[0]}
        list.push(obj)
        this.setData({
          ids: this.data.ids.concat(row[0]),
          names: this.data.names.concat(row[1]),
          tagList: this.data.tagList.concat(list)
        })
})

后来用...展开再进行拼接就可以了：

handleItemChange(e){
      console.log(e)  
      var itemList = e.detail.value
      itemList.forEach(item =>{
        var row = item.split(',')
        var list = []
        const obj = {name: row[1],value: row[0]}
        list.push(obj)
        this.setData({
          ids: this.data.ids.concat(row[0]),
          names: this.data.names.concat(row[1]),
          tagList: [...this.data.tagList,...list]
        })
})