问从JS数组中删除重复项

EN

var items=[
    { id: 1, name: 'aa' },
    { id: 1, name: 'bb' },
    { id: 2, name: 'cc' },
    { id: 1, name: 'dd' }
], newItems = [];
for (var i =0;i<items.length;i++){
    newItems[items[i].id - 1] = items[i];
}
alert(JSON.stringify(newItems));

items = items.reverse().filter((function() {
    var existing = {};
    return function(item) {
        if(existing[item.id]) {
            return false;
        }
        existing[item.id] = true;
        return item;
    }
}()));

var items = [
    { id: 1, name: 'aa' },
    { id: 1, name: 'bb' },
    { id: 2, name: 'cc' },
    { id: 1, name: 'dd' }
];

function removeDupIds(items){
    var result  = [],
        uniqIds = {},
        i       = 0,
        l       = items.length;

    for(; i<l; i++){
        uniqIds[items[i].id] = items[i].name;
    }

    for(var k in uniqIds){
        result.push({id: k, name: uniqIds[k]});
    }
    return result;
}

console.log(removeDupIds(items));