// Perform a deep comparison to check if two objects are equal. _.isEqual = function(a, b) { return eq(a, b, [], []); }; 感谢您的阅读,希望此篇文章对您有所帮助,文中不足之处欢迎批评斧正。 转载声明: 本文标题:Javascript 判断对象是否相等 本文链接:http://www.zuojj.com/archives/...
isDefaultNamespace() Returns true if a specified namespaceURI is the default, otherwise false Element isEqualNode() Checks if two elements are equal Element isFinite() Determines whether a value is a finite, legal number Global, Number isId Returns true if the attribute is of type Id, other...
Check if two rational numbers are equalboolean lt(n)Check if this rational number is less than anotherboolean lte(n)Check if this rational number is less than or equal anotherboolean gt(n)Check if this rational number is greater than another...
有两个数组，前提是数组对象是一样的。需要比较这两个数组中对象的值是否一致？需要考虑对象的顺序。
Note: createStudent function is bad because we don't check if grades.length exists or is different from 0. But it's easier to read this way, so I didn't handle this case.Object properties spreadingFor this one, I recommend you read previous explanations about the rest operator on ...
We see that, althoughspotandcosmolook really similar and are equal,they aren’t the same object. Because of that, they evaluate asequal, notthe same. The same is also true for arrays: var arr = [1, 2, 3]; expect(arr).toEqual([1, 2, 3]); // success; equivalent expect(arr).to...
try { number(); } catch (e) { ok(true, 'number() is undefined.'); } number = function number() { return 2; } equal(number(), 2, 'number() is defined now.'); }()); equal(number(), 1, 'Outer scope still works.'); }); Tip If you declare all of your variables at th...
In Example 2, we are checking to make sure the array is not empty by using something called Truthy Falsy. This example is very similar to Example 1, but it uses a little less code and is more efficient. In the last example, we had to check to see if the length of the array is ...
The in operator returns true if a property is in an object, otherwise false:Object Example const person = {firstName:"John", lastName:"Doe", age:50}; ("firstName" in person); ("age" in person); Try it Yourself » Note You cannot use in to check for array content like ("...
// Check if the count of the element is greater than or equal to 2 if (object[prop] >= 2) { // Add the element to the result array result.push(prop); } } // Return the array containing duplicate elements return result; }; ...