using typeof

Transferred from: Http://blog.csdn.net/gexueyuan/article/details/6930228 Understanding 1: Typedef is used to define the type alias, which is available in C/C ++ and is a feature of language and has nothing to do with MFC. For exampleTypedef int *

This is mainly about the type judgment function of JavaScript typeof and judging the use and attention of the prototype instanceof of the constructor. typeof Let's talk about typeof first. The first thing to note is that the TypeOf method returns

The typeof in JavaScript is actually very complicated. It has six types of returned data, which can be used to do many things, but it also has a lot of weird performances. this article lists its usage. For more information, see. Arrays are used in

This article mainly introduces the usage and differences of the instanceof and typeof operators in JavaScript. For more information, see instanceof and typeof in JavaScript ), however, they are used differently: Typeof OperatorReturns a string that

JavaScript typeof and instanceof are commonly used to determine whether a variable is empty, or what type it is. But there is a difference between them:typeofTypeOf is a unary operation that can be any type before it is placed in an operand.The

1. Function: The typeof operator returns a String that represents the data type of an expression.possible strings are: "Number", "string", "Boolean", "Object", "function", and "undefined". 2, the common return value explanation An

The typeof in JavaScript is actually very complex, it can be used to do a lot of things, but also has a lot of weird performance. This article lists its many uses, but also points out the existing problems and solutions.https://developer.mozilla.org/

The typeof in JavaScript is actually very complex, it can be used to do a lot of things, but also has a lot of weird performance. This article lists its many uses, but also points out the existing problems and solutions.https://developer.mozilla.org/

The typeof in JavaScript is actually very complex, it can be used to do a lot of things, but at the same time there are a lot of weird performance. This article enumerates several usages of it, and also points out the existing problems and solutions.

Instanceof and typeof in JavaScript are often used to determine what type of variable is (an instance), but their use is different: typeof operatorReturns a string that is used to represent the data type of an expression. typeof expression; The