js 对象排序

let a = [
    {id:5, level: 1},
    {id:1, level: 4},
    {id:4, level: 5},
    {id:3, level: 2},
    {id:2, level: 3}
]

function objSort(obj1, obj2) {
    if(obj1.id !== obj2.id) {
        if(obj1.id > obj2.id) {
            return 1;
        }
        return -1;
    }
    return 0;
}

console.log(a.sort(objSort)); 
/**
 * [ 
     { id: 1, level: 4 },
     { id: 2, level: 3 },
     { id: 3, level: 2 },
     { id: 4, level: 5 },
     { id: 5, level: 1 } 
    ]
 */