Javascript，将字符串转换为对象属性

Question

I am wondering if it is possible to have an object with some attributes for example:

object name: Human

this.age = 8
this.name = "Steve"

Then have an array of strings which contain each attribute to that object such as:

manAttributes = ["age","name"]

So therefore if i wrote

console.log(Human.manAttributes[0])

The console should log ' 8 ' But this doesn't work, I get unexpected string.

Thanks

Answer 1

An object is a key:value pair. The key and value are separated by a : (colon). In your case, you have separated by = . Change your code as below:

 var Human = {
     manAttributes: ["age","name"],
     age: 8
 };
 alert(Human[Human.manAttributes[0]]);  //alerts 8

This solution considers manAttributes as a property of Human object. If manAttributes is a separate array outside the Human object, then,

 var manAttributes = ["age","name"];
 var Human = {
     age: 8
 };
 alert(Human[manAttributes[0]]);  //alerts 8

Answer 2

if you are looking at iterating through the properties, i would suggest the following approach.

var human = {      
  name: "Smith",
  age: "29"      
};

var manAttributes = ["age","name"];

for(var prop in manAttributes){
  if(human.hasOwnProperty(manAttributes[prop])){
    console.log(human[manAttributes[prop]]);
  }  
} 

DEMO

Answer 3

Object properties can be accessed through either dot notation or bracket notation (see Mozilla's JavaScript reference ).

So, this will output what you want:

console.log(Human[manAttributes[0]]);

Answer 4

You'd be needing:

Human[manAttributes[0]]

The [] syntax being the way of accessing a property by (variable) name rather than by constant literal token.

Answer 5

function Human(age,name) {
  this.age = age;
  this.name = name;
}
var self = new Human(8,'Steve');

var humanProperties = Object.getOwnPropertyNames(self);

console.log(self[humanProperties[0]])