JS array list actual use summary

1 Take out ListA An attribute in the element of is converted to ListB

effect ：

 

Code ：

let myLabelList = this.formData.labelList.map( item => {
    return item.label
})

2 List Convert to comma separated string

effect ：

  Code ：

let myLabelList = [111,222,333]
let labelStr = myLabelList.toString()