js将数组中一个或多个字段相同的子元素中合并

//将经济事项设置号相同的分为一组，economicIssuesNo：经济事项设置号；economicIssuesName：经济事项名称
        function jsonUntil(arr){
            var map = {}, 
            dest = []; 
            for(var i = 0; i < arr.length; i++){ 
                var ai = arr[i]; 
                if(!map[ai.economicIssuesNo]){ 
                        dest.push({ 
                            economicIssuesNo: ai.economicIssuesNo,
                            economicIssuesName:ai.economicIssuesName,
                            data: [ai] 
                        }); 
                        map[ai.economicIssuesNo] = ai; 
                }else{ 
                    for(var j = 0; j < dest.length; j++){ 
                        var dj = dest[j]; 
                        if(dj.economicIssuesNo == ai.economicIssuesNo){ 
                            dj.data.push(ai); 
                            break; 
                        } 
                    } 
                } 
            } 
            return JSON.stringify(dest);
        }