• How to implement the new operator of JavaScript


    catalogue Constructor New operator Implement a new Constructor Before introducing new, you must know what a constructor is. There is no difference in writing between constructors and ordinary functions. When a function is called through new fun(), it is called a constructor, and the first letter of the constructor is usually capitalized. function User(name) { […]

  • What is the difference between JS regular expression literals and regular expressions created using the new regexp constructor


    When we only use character replacement in JS, we often encounter two writing methods, direct literal 1、str.replace(/&nbsp;/ig,””); 2. New regexp Test code <form name=form1> String: < input name = “T1” value = “123456” > Mode: / < input name = “T2” value = “^ \ d * $” >/ </form> <script language=javascript> function c1() { […]

  • python__ new__ Built in static method usage analysis


    This article mainly introduces python__ new__ Built in static method use parsing, this article through the example code is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to When you create an object with the class name (), the Python interpreter calls__ new__ Method to allocate […]

  • Process instance analysis of an object in Java NEW


    This article mainly introduces the Java new process of an object instance analysis, the article through the example code is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to When Java is creating an object, it will first check whether the class to which the object […]

  • On the efficiency of JS regular literal / / and new regexp


    A few days ago, we talked about the problem of regular matching JS string: “matching string of JS regular learning notes” and “matching string optimization of JS regular learning notes”.It is said that optimizing regularization can improve performance, but how much can it be improved?So I went to the test and found that TMD was […]

  • Detailed explanation of the difference between make and new in golang


    Preface This article mainly introduces to you the relevant contents about the difference between make and new in golang, and shares them for your reference and study. Let’s have a look at the detailed introduction together Both new and make can be used to allocate space and initialize types, but they are different. New (T) […]

  • In-depth explanation of the use and difference between new and make functions in go language


    Preface This paper mainly introduces the use and difference of function new and make in go language. New and make are built-in functions in go language, which are mainly used to create allocation type memory. When we define the generated variables, we may feel a little confused. In fact, their rules are very simple. Let’s […]

  • How to make users only modify new data in PB


    When designing the data window, write the following expression in the background.color attribute of all columns:if ( IsRowNew(), 1090519039, Long(Describe(“Datawindow.Color”))) In this way, the user can know that the data of these lines is the original record and cannot be modified or deleted. Then write the following expression in the protection attribute of each column:if […]

  • Analysis of the differences among new, collection and member in rails routes


    There are seven restful routing verbs by default (index, show, create, new, edit, update, destroy). Sometimes we need to customize the route, and then we need to use the: on parameter. : the on parameter has three values: collection, member, and new. If you want to add a route in member mode, you can do […]

  • The difference between golang new and make


    In Go, both new and make are primitives for memory allocation. Simply put, new allocates only memory, and make is used for the initialization of slice, map, and channel. new The new (T) function is a built-in function that allocates memory. As we all know, for an existing variable, its pointer can be assigned. Example […]

  • Introduction to Eval and New Function


    Code: Copy codeThe code is as follows: // Friendly Reminder: For your finger safety, please run under Chrome‘alert(“hello”)’.replace(/.+/, eval); ‘alert(“hello”)’.replace(/.+/, function(m){new Function(m)();}); var i = 0; eval(new Array(101).join(‘alert(++i);’)); var i = 0; new Function(new Array(101).join(‘alert(++i);’))(); Interpretation:1. string. replace (regexp, replacement): replacement can be a function. In this case, the function is invoked for each match, […]

  • A Simple Method of Updating Ports Tree


    #vi /etc/protsnap.conf SERVERNAME = portsnap. freebsd. ORG Change to portsnap.tw.freebsd.org # Portsnap fetch # Portsnap extract Until it appears Building new INDEX files…..done.