js为Object对象动态添加属性和值 eval c.k c[k]

const appendInfo = () => {
  const API_SECRET_KEY = 'https://github.com/dyq086/wepy-mall/tree/master/src'
  const TIMESTAMP = 'util.getCurrentTime()'
  const SIGN = 'md5.hex_md5((TIMESTAMP + API_SECRET_KEY).toLowerCase())'
  return {
    'API_SECRET_KEY': API_SECRET_KEY,
    'TIMESTAMP': TIMESTAMP,
    'SIGN': SIGN
  }
}

let data = {}
const isSign = 2 || false
if (isSign) {
  const a = appendInfo()
  for (let k in a) {
    console.log(k)
    console.log(a.k)
    eval('data.' + k + '= a.' + k)
  }
}
console.log(data)

let a =3
let b = {}
while(a){
eval('b.tag_'+(a-1)+'='+a*a)
a--
}

  {tag_2: 9, tag_1: 4, tag_0: 1}

let a =3
let b = {}
while(a){
eval('b.tag_'+(a-1))
a--
}

  {}

c.k  添加的属性名为"k"

c[k]                          k的值

删除 

this.notHere

 

onNavbarTap(e) {

const idx = e.currentTarget.dataset.idx

this.nav.currentTab = idx

switch (idx) {

case 1:

delete this.notHere.package

this.notHere.PickerVal = [this.bizArea[0][1], this.bizType[0][1]]

this.getPartnerSitesPart()

break

case 2:

 

 

关于给javascript对象添加、删除、修改对象的属性 - goweb - 博客园 https://www.cnblogs.com/goweb/p/5357640.html

 

• 利用动态特性

 1             function Person(){};
 2             var person = new Person();
 3             person.name = 'yy';
 4             person.gender = 'girl';
 5             console.log(person.name+','+person.gender);//yy,girl
 6             delete person.name;//删除属性
 7             console.log(person.name);//undefined
 8 //            变式
 9             function Person(){};
10             var person = new Person();
11             person['name'] = 'yy';
12             person['gender'] = 'girl';
13             console.log(person.name+','+person.gender);//yy,girl
14             delete person.name;//删除属性
15             console.log(person.name);//undefined                    

• 构造函数中this

var Person = function (){
                this.name = 'yy';
                this.gender = 'girl'
            };
            var person = new Person();
            console.log(person.name+','+person.gender);//yy,girl

• 原型中添加属性

var Person = function (){    
            };
            Person.prototype.name = 'yy';
            Person.prototype.gender = 'girl';
            var person = new Person();
            console.log(person.name+','+person.gender);//yy,girl
            console.log(person['name']+','+person['gender']);//yy,girl

• 字面量添加属性

var person = {    
            };
            person.name = 'yy';
            person.gender = 'girl';
            console.log(person.name+','+person.gender);//yy,girl
            console.log(person['name']+','+person['gender']);//yy,girl
//            另一种写法
            var person = {
                name: 'yy',
                gender: 'girl'
            };
            console.log(person.name+','+person.gender);//yy,girl
            console.log(person['name']+','+person['gender']);//yy,girl

• 封装extend方法

var p1 = {};
            var p2 = {name:'yy',gender:'girl'};
            p1.extend = function(obj){
                for(var k in obj){
                    this[k] = obj[k];
                }
            }
            p1.extend(p2);
            console.log(p1.name+','+p1.gender);//yy,girl
            console.log(p1['name']+','+p1['gender']);//yy,girl

 

 

let formData = {}
formData['key'] = ossKey
formData['OSSAccessKeyId'] = AccessKeyId
formData['policy'] = PolicyBase64
formData['Signature'] = Signature
formData['x-oss-security-token'] = STS.SecurityToken

return {
key: ossKey,
OSSAccessKeyId: AccessKeyId,
policy: PolicyBase64,
Signature: Signature
}