JavaScript null check在PTT/mobile01評價與討論，在ptt社群跟網路上大家這樣說

JavaScript null check在How to Check for an Object in Javascript (Object Null Check)

There's a long-standing bug in JavaScript meaning that every check for an object requires a check for null : typeof null === "object" .

JavaScript null check在How to Check Null Value in JavaScript | Techwalla

Using null parameters in JavaScript allows programmers to define a variable without assigning a value to it. Null values are used in simple variables like ...

JavaScript null check在

JavaScript null check在null and undefined in JavaScript - TutorialsTeacher

undefined · null and undefined are primitive values in JavaScript. · A null value means absence. · An undefined value means lack of value. · A null or undefined ...

JavaScript null check在[轉][Javascript] JS 中如何判断－null @ 碎碎念 - 隨意窩

以下是不正确的方法： var exp = null;if (exp == null){ alert("is null");} exp 为undefined 时，也会得到与null 相同的结果，虽然null 和undefined 不一样。

JavaScript null check在An Essential Guide to JavaScript null

JavaScript null is a primitive type that contains a special value null . JavaScript uses the null value to represent the intentional absence of any object ...

JavaScript null check在How to Check for null in JavaScript | by Dr. Derek Austin

One way to check for null in JavaScript is to check if a value is loosely equal to null using the double equality == operator: As shown above, null is only ...

JavaScript null check在null - JavaScript - MDN Web Docs

The value null represents the intentional absence of any object value. It is one of JavaScript's primitive values (en-US).

JavaScript null check在JavaScript null check - Stack Overflow

Just use if (data) . It's mnemonic Javascript way to check if data variable evaluates to true. undefined , null , false, 0, empty string, ...