将数组元素作为属性名称注入时,JavaScript字典语法错误

Question

我正在运行此代码,但它给出了奇怪的结果？

let surveyTypes = [1,2];

let surveyDuration = {
  surveyTypes[0]:  'first',surveyTypes[1]:  'second' 
}

预期产出:

surveyDuration={1:'first',2:'second'}

实际产量:

未捕获的SyntaxError:意外的令牌[

Answer 1

您必须wrap将数组的项放入括号中,因为您正在创建dynamic键.

let surveyTypes = [1,2];

let surveyDuration = {
  [surveyTypes[0]]:  'first',[surveyTypes[1]]:  'second' 
}

console.log(surveyDuration);