javascript - 如何从JavaScript中的变量值创建对象属性？ [重复](How to create an object property from a variable value in JavaScript? [duplicate])

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Add a property to a JavaScript object using a variable as the name?

(使用变量作为名称向JavaScript对象添加属性？)

(11 answers)

(（11个答案）)

Closed 4 years ago .

(4年前关闭。)

I want to add a new property to 'myObj', name it 'string1' and give it a value of 'string2', but when I do it it returns 'undefined:

(我想向“ myObj”添加一个新属性，将其命名为“ string1”，并为其赋予一个值“ string2”，但是当我这样做时，它返回“ undefined”：)

var myObj = new Object;
var a = 'string1';
var b = 'string2';
myObj.a = b;

alert(myObj.string1); //Returns 'undefined'
alert(myObj.a); //Returns 'string2'

In other words: How do I create an object property and give it the name stored in the variable, but not the name of the variable itself?

(换句话说：如何创建对象属性，并为其赋予变量中存储的名称，而不是变量本身的名称？)

  ask by ecu translate from so

Answer 1

有点符号和方括号符号

myObj[a] = b;