JS怎么把for循环出来的东西放到一个数组里

var students=[

{name: "vehicleTravelLicenseCopyBack", id: "a1"},

{name: "vehicleTravelLicenseCopyFront", id: "a2"},

{name: "idCardBack", id: "a3"},

{name: "idCardFront", id: "a4"}

      ]
        
        var arr=[];
        for(var i=0;i<students.length;i++){
             
           arr.push(students[i]['id']);
        }
         
        console.log(arr,'4555');