Object.keys(obj) -----根據(jù)對(duì)象的鍵形成的數(shù)組
Object.entries(obj) ---- 根據(jù)對(duì)象的鍵值對(duì)形成的數(shù)組
Object.values(obj)----根據(jù)對(duì)象的值形成的數(shù)組

var obj ={"A": "阿根廷",
        "B": "巴西",
        "C": "智利"}
Object.entries(obj)

image.png

Object.keys(obj)

image.png

Object.values(obj)

image.png

var obj ={"A": "阿根廷",
        "B": "巴西",
        "C": "智利"}
        let arry=Object.values(obj)
        let newArry=Object.keys(obj).map((item,index,ary)=>{
          return {
             value:item,
             label:arry[index]
          }
        })
        console.log('Object.entries(obj) :>> ', newArry);

image.png