排序：根据数组里某个对象排序

<script>

    let arr=[

        {id:1,name:"aaa",age:12},

        {id:2,name:"bbb",age:20},

        {id:3,name:"ccc",age:5},

        {id:4,name:"ddd",age:18}

    ]

    function sortKey(array,key){

    return array.sort(function(a,b){

        return a[key]-b[key]

    })

    }

    console.log(sortKey(arr,'age'))

</script>