Question

Javascript阵列推送问题

我有一个对象：

people: [{name: peter, age: 27, email:'peter@abc.com'}]

我想推动：

people.push({
        name: 'John',
        age: 13,
        email: 'john@abc.com'
});
people.push({
        name: 'peter',
        age: 36,
        email: 'peter@abc.com'
});

我最终想要的是：

people: [
{name: 'peter', age: 36, email:'peter@abc.com'},
{name: 'john', age: 13, email:'john@abc.com'},
]

我没有任何密钥，但电子邮件是唯一的

Answer 1

JavaScript中没有“更新”方法。

您需要做的只是首先循环遍历数组以检查对象是否已经在内部。

function AddOrUpdatePeople(people, person){
    for(var i = 0; i< people.length; i++){
        if (people[i].email == person.email){
            people[i].name = person.name;
            people[i].age = person.age;
            return;                          //entry found, let's leave the function now
        }
    }
    people.push(person);                     //entry not found, lets append the person at the end of the array.
}

Answer 2

您也可以通过生成Array方法来执行此操作。它需要两个参数。第一个指定要推送的对象，第二个是要检查以替换先前插入的项目的唯一属性。

var people = [{name: 'peter', age: 27, email:'peter@abc.com'}];
Array.prototype.pushWithReplace = function(o,k){
 var fi = this.findIndex(f => f[k] === o[k]);
 fi != -1 ? this.splice(fi,1,o) : this.push(o);
 return this;
};
people.pushWithReplace({name: 'John', age: 13, email: 'john@abc.com'}, "email");
people.pushWithReplace({name: 'peter', age: 36, email: 'peter@abc.com'},"email");
console.log(people);

Javascript数组添加或更新

2 个答案: