我有一个json对象,如下所示。我想删除" otherIndustry"通过使用下面没有工作的代码输入及其价值。
var updatedjsonobj = delete myjsonobj['otherIndustry'];
如何删除Json对象特定键及其值。 下面是我的示例json对象,我想删除" otherIndustry"关键及其价值。
var myjsonobj = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
};
delete myjsonobj ['otherIndustry'];
console.log(myjsonobj);
其中日志仍然打印相同的对象而不删除' otherIndustry'从对象进入。
答案 0 :(得分:19)
delete
运算符用于remove
对象property
。
delete
运算符不返回新对象,只返回boolean
: true 或 false 。
另一方面,在解释器执行var updatedjsonobj = delete myjsonobj['otherIndustry'];
后,updatedjsonobj
变量将存储boolean
值。
如何删除Json对象特定键及其值?
您只需要知道属性名称,以便从对象的属性中删除它。
delete myjsonobj['otherIndustry'];
let myjsonobj = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
}
delete myjsonobj['otherIndustry'];
console.log(myjsonobj);
如果要在知道值时删除key
,可以使用Object.keys
函数返回给定对象自己的可枚举属性的数组。
let value="test";
let myjsonobj = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
}
Object.keys(myjsonobj).forEach(function(key){
if(myjsonobj[key]==value)
delete myjsonobj[key];
});
console.log(myjsonobj);
答案 1 :(得分:3)
按照这个,它可能就像你在看的那样:
var obj = {
Objone: 'one',
Objtwo: 'two'
};
var key = "Objone";
delete obj[key];
console.log(obj); // prints { "objtwo": two}
答案 2 :(得分:2)
这里是另一个示例。 (选中 reference )
const myObject = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
};
const {otherIndustry, ...otherIndustry2} = myObject;
console.log(otherIndustry2);
.as-console-wrapper {
max-height: 100% !important;
top: 0;
}
答案 3 :(得分:2)
有几种方法可以做到,让我们一一看一下:
const myObject = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
};
delete myObject['currentIndustry'];
// OR delete myObject.currentIndustry;
console.log(myObject);
let myObject = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
};
myObject.currentIndustry = undefined;
myObject = JSON.parse(JSON.stringify(myObject));
console.log(myObject);
const myObject = {
"employeeid": "160915848",
"firstName": "tet",
"lastName": "test",
"email": "test@email.com",
"country": "Brasil",
"currentIndustry": "aaaaaaaaaaaaa",
"otherIndustry": "aaaaaaaaaaaaa",
"currentOrganization": "test",
"salary": "1234567"
};
const {currentIndustry, ...filteredObject} = myObject;
console.log(filteredObject);
或者如果您可以使用下划线 js库的 omit():
const filteredObject = _.omit(currentIndustry, 'myObject');
console.log(filteredObject);
何时使用什么?
如果您不想创建新的过滤对象,只需选择选项1或2。请确保使用 let 定义对象,同时选择第二个选项,因为我们要覆盖价值观。否则,您可以使用其中任何一个。
希望这会有所帮助:)
答案 4 :(得分:0)
我在尝试删除返回的JSON对象时遇到问题,发现它实际上是一个字符串。如果您在删除之前使用JSON.parse(),则可以确保您的密钥将被删除。
let obj;
console.log(this.getBody()); // {"AED":3.6729,"AZN":1.69805,"BRL":4.0851}
obj = this.getBody();
delete obj["BRL"];
console.log(obj) // {"AED":3.6729,"AZN":1.69805,"BRL":4.0851}
obj = JSON.parse(this.getBody());
delete obj["BRL"];
console.log(obj) // {"AED":3.6729,"AZN":1.69805}
答案 5 :(得分:0)
function omit(obj, key) {
const {[key]:ignore, ...rest} = obj;
return rest;
}
您可以像这样使用ES6传播运算符。而要删除密钥,只需致电
const newJson = omit(myjsonobj, "otherIndustry");
如果在javascript中处理type=object
时保持纯函数,总会更好。