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2016.8.01 "" Null undefined NaN 0 Special comparison is true or false

Label:In the JavaScript world, whether it's a function, an array, an object, or a string, a number, or a Boolean type, there are always a few maverick in these data types, and then there are some nasty bugs that are dispensable.The reason these

The difference between null, Nan, and undefined in Javascript

Label:1. Type analysis: JS data types have undefined,boolean,number,string,object, such as 5, the first 4 are the original type, the 5th is the reference type. Code: varA1;varA2= true;varA3= 1;varA4= "Hello";varA5= NewObject

False, 0, null, undefined, and empty string objects in Javascript

Label:In JavaScript, we are often exposed to the 5 more special objects mentioned in the topic--false, 0, empty strings, null, and undefined. These objects are easy to use, so you have to be careful when you use them.Type detectionLet's come down

The difference between null and undefined

Label:Null: indicates no value;Undefined: Represents an undeclared variable, or a variable that has been declared but not assigned a value, or an object property that does not exist. The = = operator considers the two equal. If you want to

Understanding javascript__ Understanding undefined and null

Label:From the general answer:In fact, in the original type of ECMAScript, there are undefined and Null types. Both of these types correspond to their own unique private values, namely undefined and null.The value undefined is actually derived from

Null and undefined in JavaScript

Label:Null: indicates no value;Undefined: Represents an undeclared variable,Or a variable that has been declared but not assigned a value,Or an object property that does not exist.The = = operator considers the two equal. If you want to

The difference between null and undefined in JS

Label:Reference article: http: // www.jb51.net/article/27937.htmhttp://www.cnblogs.com/eastday/archive/2010/03/03/1677324.htmlFirst of all:Null = = undefined; True, ECMAScript that undefined is derived from null, so define them as equal.Null = =

False, 0, null, undefined, and empty string objects in Javascript

Label:In JavaScript, we are often exposed to the 5 more special objects mentioned in the topic--false, 0, empty strings, null, and undefined. These objects are easy to use, so you have to be careful when you use them.Type detectionLet's come down

False, 0, null, undefined, and empty string objects in Javascript

Label:In JavaScript, we are often exposed to the 5 more special objects mentioned in the topic--false, 0, empty strings, null, and undefined. These objects are easy to use, so you have to be careful when you use them.Type detectionLet's come down

JS's understanding of (function (window, undefined) {}) (window) notation

Label:JS about [function (window, undefined) {}] (window) writing comprehension [Network collation](Function (window, undefined) {}) (window);Well, why would you pass window and undefined as arguments to it?(function ($, undefined) {}) (JQuery);

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