我要评论一 有几种方法可以用来修改javascript数组中对象的属性：
- 使用array.map()方法
- 使用for-of循环
- 使用具有扩展运算符的array.map()方法
- 使用foreach()方法
- 使用find()方法和解构。
方法1：使用array.map()方法
使用map()方法根据指定的函数，通过转换原始数组的每个元素来创建一个新的数组。
let employees_data = [
{
employee_id: 1,
employee_name: "aman",
},
{
employee_id: 2,
employee_name: "bhargava",
},
{
employee_id: 3,
employee_name: "chaitanya",
},
];
const modifiedemployees = employees_data.map(obj => {
if (obj.employee_id === 2) {
return { ...obj, employee_name: "rahul" };
}
return obj;
});
console.log(modifiedemployees);
输出
[
{ employee_id: 1, employee_name: 'aman' },
{ employee_id: 2, employee_name: 'rahul' },
{ employee_id: 3, employee_name: 'chaitanya' }
]
方法2：使用for-of循环
使用for循环遍历一个包含对象的数组，根据条件查找并修改特定对象的属性。
let employees_data = [
{
employee_id: 1,
employee_name: "aman",
},
{
employee_id: 2,
employee_name: "bhargava",
},
{
employee_id: 3,
employee_name: "chaitanya",
},
];
for (let object of employees_data) {
if (object.employee_id === 2) {
object.employee_name = "anthony";
}
}
console.log("updated data: ");
console.log(employees_data);
输出
updated data:
[
{ employee_id: 1, employee_name: 'aman' },
{ employee_id: 2, employee_name: 'anthony' },
{ employee_id: 3, employee_name: 'chaitanya' }
]
方法3：使用array.map()与扩展运算符
使用array.map()创建一个带有扩展运算符的新数组，以修改特定对象的属性。
employees_data.map((employee) => {
if (employee.employee_id === 2) {
return {
...employee,
employee_name: "anthony",
};
}
return employee;
});
示例： 在这个示例中，我们将使用array.map()方法以及spread operator（…）将对象自身展开，以便通过使用先前创建的对象数组来更新现有对象的属性值。
let employees_data = [
{
employee_id: 1,
employee_name: "aman",
},
{
employee_id: 2,
employee_name: "bhargava",
},
{
employee_id: 3,
employee_name: "chaitanya",
},
];
let new_updated_data =
employees_data.map((employee) => {
if (employee.employee_id === 2) {
return {
...employee,
employee_name: "anthony",
};
}
return employee;
});
console.log("updated data: ");
console.log(new_updated_data);
输出
updated data:
[
{ employee_id: 1, employee_name: 'aman' },
{ employee_id: 2, employee_name: 'anthony' },
{ employee_id: 3, employee_name: 'chaitanya' }
]
方法4：使用 foreach() 方法
使用 foreach() 方法，遍历对象数组，检查条件并修改匹配对象的属性
let employees_data = [
{
employee_id: 1,
employee_name: "aman",
},
{
employee_id: 2,
employee_name: "bhargava",
},
{
employee_id: 3,
employee_name: "chaitanya",
},
];
const modifyproperty = (arr, targetid, newproperty) => {
arr.foreach(obj => {
if (obj.employee_id === targetid) {
obj.employee_name = newproperty;
}
});
};
modifyproperty(employees_data, 2, "ankit");
console.log(employees_data);
[
{ employee_id: 1, employee_name: 'aman' },
{ employee_id: 2, employee_name: 'ankit' },
{ employee_id: 3, employee_name: 'chaitanya' }
]
方法5：使用find()方法和解构
使用find()方法搜索具有指定属性值的对象，并使用解构修改属性。
let employees_data = [
{
employee_id: 1,
employee_name: "aman",
},
{
employee_id: 2,
employee_name: "bhargava",
},
{
employee_id: 3,
employee_name: "chaitanya",
},
];
const modifyproperty = (arr, targetid, newproperty) => {
const targetobj = arr.find(obj => obj.employee_id === targetid);
if (targetobj) {
targetobj.employee_name = newproperty;
}
};
modifyproperty(employees_data, 2, "kavita");
console.log(employees_data);
[
{ employee_id: 1, employee_name: 'aman' },
{ employee_id: 2, employee_name: 'kavita' },
{ employee_id: 3, employee_name: 'chaitanya' }
]
二 javascript删除数组对象中的某个对象里的某个属性
方法1:使用for循环
let employ = [
{
employid: 1,
employname: "aman",
employage:"15"
},
{
employee_id: 2,
employee_name: "bhargava",
employage:"16"
},
{
employee_id: 3,
employee_name: "chaitanya",
employage:"17"
},
];
for(var i =0;i<employ.length;i++){
if(employ[i].employid===1){
delete employ[i].employage
}}
console.log(employ)
输出:
[
{
employid: 1,
employname: "aman",
},
{
employee_id: 2,
employee_name: "bhargava",
employage:"16"
},
{
employee_id: 3,
employee_name: "chaitanya",
employage:"17"
},
];可以看到上面打印输出第一条对象里的年龄属性删除了
总结
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