问题描述
检查两个对象是否相等：
我不确定我的代码如何流动以及如何解决这个问题。
在 areEqual 函数中，我正在检查两个对象的“值”。
如果它们相等 -> isEqual=true -> 如果值之一不相等，则 for 循环将继续 -> isEqual = false 并从循环中中断。
但我没有得到想要的结果。 我在这里完全不理解什么逻辑？
function Address (street, city, zipCode) {
this.street = street;
this.city = city;
this.zipCode = zipCode;
}
let address1 = new Address('a', 'b', 'c');
let address2 = new Address('a', 'd', 'c');
//checking for equality between two objects
function areEqual(address1, address2){
let isEqual = true;
for(let key in address1) {
if(address1[key] === address2[key])
isEqual = true;
else
isEqual = false
break;
}
if(isEqual) return 'They are equal';
else return 'They are not equal';
}
console.log(areEqual(address1, address2));
1楼
adiga
1
2019-02-25 08:44:25
您的代码相当于：
if (address1[key] === address2[key])
isEqual = true;
else
isEqual = false
break;
您需要将 else 条件包装在{} 。
目前它在第一次迭代时跳出循环
function Address(street, city, zipCode) { this.street = street; this.city = city; this.zipCode = zipCode; } let address1 = new Address('a', 'b', 'c'); let address2 = new Address('a', 'd', 'c'); let address3 = new Address('x', 'y', 'z'); let address4 = new Address('x', 'y', 'z'); //checking for equality between two objects function areEqual(address1, address2) { let isEqual = true; for (let key in address1) { if (address1[key] === address2[key]) isEqual = true; else { isEqual = false break; } } if (isEqual) return 'They are equal'; else return 'They are not equal'; } console.log(areEqual(address1, address2)); console.log(areEqual(address3, address4));
如果您格式化代码，则可以避免这些类型的错误。 每个代码编辑器都有此功能的快捷方式。
注意：由于您有Address构造函数，因此此代码将起作用。
但请注意，这只是检查address1的键是否与address2具有相同的值。
如果你比较一个像areEqual({}, address2)这样的空对象areEqual({}, address2)它会记录They are equal因为它永远不会进入for循环。
因此，您可以添加额外的检查Object.keys(address1).length是否与address2相同
2楼
Dawid Wekwejt
0
2019-02-25 08:50:24
您有 isEquls: true 的默认值，因此如果任何键对不等于将 isEquls 设置为 false 并中断循环：
function Address (street, city, zipCode) {
this.street = street;
this.city = city;
this.zipCode = zipCode;
}
let address1 = new Address('a', 'd', 'd');
let address2 = new Address('a', 'd', 'c');
//checking for equality between two objects
function areEqual(address1, address2){
let isEqual = true;
for(let key in address1) {
if(address1[key] !== address2[key])
{
isEqual = false
break;
}
}
if(isEqual) return 'They are equal';
else return 'They are not equal';
}
console.log(areEqual(address1, address2));