javascript - JSLint 对象错误

Question

我正在使用 JSLint 来检查以下代码:

'use strict';

var mathService = {
   add: add,
   subtract: subtract,
   multiply: multiply,
   divide: divide,
   power: power,
   squareRoot: squareRoot
};

function add(first, second) {
   return first + second;
}

function subtract(first, second) {
   return first - second;
}

function multiply(first, second) {
   return first * second;
}

function divide(first, second) {
   return first / second;
}

function power(first, second) {
   return Math.pow(first, second);
}

function squareRoot(first) {
   return Math.sqrt(first);
}

当我尝试检查此代码时，我的对象中的每个属性都会收到一条错误消息，表明该属性未定义。但是，我没想到必须定义对象属性？预先感谢您的帮助!

Answer 1

将对象移到函数后面，例如

"use strict";

function add(first, second) {
   return first + second;
}

function subtract(first, second) {
   return first - second;
}

function multiply(first, second) {
   return first * second;
}

function divide(first, second) {
   return first / second;
}

function power(first, second) {
   return Math.pow(first, second);
}

function squareRoot(first) {
   return Math.sqrt(first);
}

var mathService = {
   add: add,
   subtract: subtract,
   multiply: multiply,
   divide: divide,
   power: power,
   squareRoot: squareRoot
};

您会收到一些警告，但不会出现错误。