Chai Library中的equal和eql有什么区别 [英] What is the difference between equal and eql in Chai Library

问题描述

我对Javascript很新，我对Chai库进行单元测试有一个简单的问题。

I'm pretty new to Javascript, and I have a quick question regarding the Chai library for making unit tests.

当我在Chai上学习一些材料时库，我看到一个声明等于断言目标严格等于（===）到值和eql断言目标与值非常相等。。

When I was studying some materials on the Chai library, I saw a statement saying equal "Asserts that the target is strictly equal (===) to value" and eql "Asserts that the target is deeply equal to value.".

但我对于严格和深度之间的差异感到困惑。

But I'm confused about what the difference is between strictly and deeply.

推荐答案

严格相等（或 === ）表示您正在将完全相同的对象与自身进行比较：

Strictly equal (or ===) means that your are comparing exactly the same object to itself:

var myObj = {
   testProperty: 'testValue'
};
var anotherReference = myObj;

expect(myObj).to.equal(anotherReference); // The same object, only referenced by another variable
expect(myObj).to.not.equal({testProperty: 'testValue'}); // Even though it has the same property and value, it is not exactly the same object

Deeply Equal 意味着比较对象的每个属性（以及可能的深层链接对象）具有相同的值。所以：

Deeply Equal on the other hand means that every property of the compared objects (and possible deep linked objects) have the same value. So:

var myObject = {
    testProperty: 'testValue',
    deepObj: {
        deepTestProperty: 'deepTestValue'
    }
}
var anotherObject = {
    testProperty: 'testValue',
    deepObj: {
        deepTestProperty: 'deepTestValue'
    }
}
var myOtherReference = myObject;

expect(myObject).to.eql(anotherObject); // is true as all properties are the same, even the inner object (deep) one
expect(myObject).to.eql(myOtherReference) // is still also true for the same reason

这篇关于Chai Library中的equal和eql有什么区别的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！