We know the code for getting the class name of a JavaScript user-defined class, although JavaScript is an object-based language. However, with its prototype feature, we can fully implement a very sexy OO compiling framework. Here we can look at the articles in the classic Fo
the following format:
Function
Jsclass(){
This
. Attribute1
=
Null
;
This
. Attribute2
=
Null
;
//
...
}
This is also the code in strfun after tostring () is executed.
Therefore, you need to be careful when getting the class name. The code for method _ typeof _ is as follows:
Function
_
We know that JavaScript is an object-based language. However, with its prototype feature, we can fully implement a very sexy OO compiling framework. Here we can look at the articles in the classic Forum 'Basically implement javascript OOP (version 0423 )'.
However, although we have implemented the 'class' concept, the JavaSc
We know that although JavaScript is an object-based (object-based) language. But using its prototype (prototype) feature, we can fully implement the very sexy OO framework, which can be seen in the Classic forum article ' essentially JavaScript OOP (version 0423) '.
However, although we have implemented the concept of ' class ', the scripting system of
. constructor: function
Var person = new Person ();Typeof person: objectTypeof person. prototype: undefinedTypeof person. constructor: function
Function. constructor: function Function () {[native code]}Function. prototype: function Empty (){}
Person. constructor: function Function () {[native code]}Person. prototype: [object Object]
Person. constructor: function Person (name, sex) {this.
person.constructor = = person to achieve the desired results?
Let's do a test, the following JavaScript code:
Copy Code code as follows:
function Person (name,sex) {this.name=name;this.sex=sex}
document.write ("document.write ("document.write ("
var person = new person ();document.write ("document.write ("document.write ("document.write ("
docum
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 js. for example, if multiple inputs with the same name are generated dynamically, you need to determine whether the i
The following is a detailed introduction to the typeof operator and some usage, analysis, and learning of typeof operators. After reading this article, we should be able to gain some benefits. The following is a detailed introduction to the typeof operator and some usage, analysis, and learning of typeof operators. Aft
This article mainly introduces how to get the object class name using javascript implementation similar to getClass () in java. The example shows how to use the getClass method in java implementation, which has some reference value, for more information about how to use javascript to get the object
Usage ScenariosIt is often used in real projects for...in... to iterate through the enumerable properties of an object, but for...in... often the attributes in the prototype obj.prototype.xxx are enumerated, so the method can be judged at the time of the loop hasOwnProperty() .function obj0 () { this.name = ‘mazey‘, this.age = ‘24‘};obj0.prototype.gender = ‘male‘;let obj1 = new obj0();// 打印所有可枚举属性for (let key in obj1) { console.log(key); // name
In javascript, typeof and instanceof are two common methods for judging data types, the purpose of this article is to analyze the shortcomings of the two methods and propose an optimization solution. In javascript, typeof and instanceof are two common methods for judging data types, this article aims to analyze the sho
This article mainly summarizes the usage of typeof in js. If you need a friend, you can refer to it and hope to help you with the complexity of typeof in JavaScript, it can be used to do many things, but it also has a lot of weird performances. this article lists its usage and points out the existing problems and solutions.
Https://developer.mozilla.org/en-US/do
This article mainly introduces information about the typeof operator and constucor attribute detection in javascript. For more information, see * # type. js.
The code is as follows:
Function Person (name, age ){This. name = name;This. age = age;}Var d = {an: 'object '};Va
The typeof in JavaScript is actually very complicated. It can be used to do many things, but it also has a lot of weird performances. This article lists its usage and points out the existing problems and solutions. The premise for reading this article is that you should now know the original values and... syntaxHighlighter. all (); typeof in
In JavaScript, typeof and Instanceof are two methods used to determine the comparison of data types, and the purpose of this article is to analyze the deficiencies of the two methods and propose an optimization scheme.
typeof
--------------------------------------------------------------------------------
typeof ret
Code is as follows:
Var a = new Number (1 );Console. log (typeof (a); // => object
The above two output results seem to have no problem, which seems to be a matter of course in the book, because javascript is designed in this way.
But! The problem is that if typeof is called, the type of a variable should be returned accurately, whether directly created with
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.
The premise of reading this article is that you should now know the difference between the original value and the object value.
Check whether a variable exi
This article mainly introduces information about the typeof operator and constucor attribute detection in javascript. For more information, see * # type. js.
The Code is as follows:
Function Person (name, age ){This. name = name;This. age = age;}Var d = {an: 'object '};Va
When writing comprespt code, the typeof and instanceof operators are used from time to time and are mandatory. But! Using them is always hard to get the desired results directly, and it is very tangled. It is widely said that "these two operators may be the biggest design defect in javascript, because it is almost impossible to get the desired results from them"
Typeof
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