var Utils = {

            joinArray:function(source,target){

                for(var i = 0;i<source.length;i++){

                    var oa = source[i];

                    for(var j = 0;j<target.length;j++){

                        var ob = target[j];

                        if(ob === undefined)continue; //break 语句用于跳出循环,continue 用于跳过循环中的一个迭代。

                        if(oa.id === ob.id){

                            Utils.copyProperties(oa,ob);

                            target.splice(j,1);

                            break;

                        }

                    }

                }

                for(var i = 0;i<target.length;i++){

                    source.push(target[i]);

                }

                return source;

            },

            copyProperties:function(source,target){

                for(var prop in target){            //遍历数组或者对象的属性（对数组或者对象的属性进行循环操作）。

                    source[prop] = target[prop];

                }

                return source;

            }

        };

        var a = [

            {id: 10001, name: "Lisa", age: 16},

            {id: 10002, name: "Bob", age: 22},

            {id: 10003, name: "Alice", age: 20}

        ];

        var b = [

            {id: 10001, gender: "Female"},

            {id: 10002, name: "Bob King", birthday: "1996-01-22"},

            {id: 10005, name: "Tom", birthday: "2000-01-01"}

        ];

        Utils.joinArray(a,b);

        console.log(a);