最近碰到了一個bug

var persons = [{ number: 1, age: 11, name: "wanghaha", money: -1 }, { number: 2, age: 12, name: "王一一", money: -3 }, { number: 3, age: 13, name: "王三十", money: 4 }];
        var per_con = [];

        for (var i = persons.length; i > 0; i--) {
            if (persons[i-1].money > 0) {
                per_con.push(persons[i-1]);
            }
        }
        console.log("111"+persons);
        console.log("222"+per_con);
        var pp = { number: 0, age: 0, name: "", money: 0 };
        persons.push(pp);
        for (var i = persons.length; i > 0; i--) {
            if (persons[i - 1].number > 2) {
                persons[i].number += 1;
                persons[i].age = persons[i - 1].age;
                persons[i].name = persons[i - 1].name;
                persons[i].money = persons[i - 1].money;
            }
            if (persons[i - 1].number == 2) {
                persons[i].number = 2;
                persons[i].age = 100;
                persons[i].name = "王插隊";
                persons[i].money = -90;
            }
        }
        console.log("333"+persons);
        console.log("444"+per_con);

　　結果：

console.log("111"+persons);
0: {number: 1, age: 11, name: "wanghaha", money: -1}
1: {number: 2, age: 12, name: "王一一", money: -3}
2: {number: 3, age: 13, name: "王三十", money: 4}

console.log("222"+per_con);
0: {number: 3, age: 13, name: "王三十", money: 4}

console.log("333"+persons);
0: {number: 1, age: 11, name: "wanghaha", money: -1}
1: {number: 2, age: 12, name: "王一一", money: -3}
2: {number: 2, age: 100, name: "王插隊", money: -90}
3: {number: 1, age: 13, name: "王三十", money: 4}

console.log("444"+per_con);
0: {number: 2, age: 100, name: "王插隊", money: -90}

看得出來：per_con的值因為繫結資料發生了變化，相當於只保留了persons[2]

問題出在per_con.push(persons[i-1]);

解決方法1：解除繫結

 per_con.push(persons[i-1]);替換成

console.log("444"+per_con);

0:{number:3,age:13,name:"王三十",money:4}

解決方法1：替換繫結

 function extend(o,p){
            for(index in p){
                o[index] = p[index];
            }
            return(o);
        }
        var persons = [{ number: 1, age: 11, name: "wanghaha", money: -1 }, { number: 2, age: 12, name: "王一一", money: -3 }, { number: 3, age: 13, name: "王三十", money: 4 }];
        var per_con = [];

        for (var i = persons.length; i > 0; i--) {
            if (persons[i-1].money > 0) {
                var p = {};
                extend(p , persons[i-1]);
                per_con.push(p);
            }
        }
        console.log("111"+persons);
        console.log("222"+per_con);
        var pp = { number: 0, age: 0, name: "", money: 0 };
        persons.push(pp);
        for (var i = persons.length; i > 0; i--) {
            if (persons[i - 1].number > 2) {
                persons[i].number += 1;
                persons[i].age = persons[i - 1].age;
                persons[i].name = persons[i - 1].name;
                persons[i].money = persons[i - 1].money;
            }
            if (persons[i - 1].number == 2) {
                persons[i].number = 2;
                persons[i].age = 100;
                persons[i].name = "王插隊";
                persons[i].money = -90;
            }
        }
        console.log("333"+persons);
        console.log("444"+per_con);

新增替換函式

function extend(o,p){
　　for(index in p){
　　　　o[index] = p[index];
　　}
　　return(o);
}

per_con.push(persons[i-1]);替換成

var p = {};
extend(p , persons[i-1]);
per_con.push(p);
也成功解決

console.log("444"+per_con);

0:{number:3,age:13,name:"王三十",money:4}