根据数组中的对象的多个属性值排序，多条件排序；var arr6 = [{id:10,age:2},{id:5,age:4},{id:6,age:10},{id:9,age:6},{id:2,age:8},{id:10,age:9}];arr6.sort(function(a,b){ if(a.id === b.id){//如果id相同，按照age的降序 return b.age - a.age }else{ retur...