standable desk

first, JavaScript implements the three-layer meaning of inheritance:instances of the ① subclass can share methods of the parent class;② subclasses can override the methods of the parent class or extend a new method;both the ③ subclass and the parent class are instances of subclasses. Second, the implementation of several methods of inheritance:1. Prototype chain inheritanceExample: function Box () {//inherited functions are called super (parent) type;this.name = "Andy"; }function

box = new MyString (' Lee '); Much more tedious than adding directly to the reference prototypeAlert (box.addstring ());In some secure environments, such as prohibit the use of this and new, this is the constructor that does not use this,The new here is to not use new when instantiating the constructor externally. This method of creation is called a secure constructor.function Box (name, age) {var obj = new Object ();Obj.run = function () {Return name + Age + ' running ... '; Direct printing of

Because the scaffolding was used to create the project, the first time to learn to create Webpack packaging. Loader I was copying someone else's.Module: { loaders: [ { test:/\.js?$/, exclude:/(Node_modules)/, loader: ' Babel-loader ', Query: { presets: [' react ', ' es2015 '} } ] },The results were packed with an error.ERROR in./js/index.jsModule build Failed:error:plugin/preset files is not allowed to export objects, only functions. In I:\

literal way to rewrite the prototype, because it will cut off the connection between the instance and the new prototype.Parasitic constructorsfunction Box (name, age) {var obj = new Object ();Obj.name = name;Obj.age = age;Obj.run = function () {Return this.name + this.age + ' running ... ';};return obj;}Secure constructor functionfunction Box (name, age) {var obj = new Object ();Obj.run = function () {Return name + Age + ' running ... '; Direct printing of parameters can be};return obj;}var box

papers and read the Linux scheduling. Therefore, write scheduling-related items first. First, we will introduce the human scenario corresponding to the process environment: This is a company where many people (processes) have their corresponding titles (priorities ). This company is very strange, there is only one desk (CPU), at any time, only one person at work (task_running is running ). Others, either temporarily rest in the lounge (corresponding

the use of this and new, this is not used in the constructor, where new is not used when the constructor is instantiated externally. This method of creation is called a secure constructor.function Box (name, age) {var obj = new Object ();　　Obj.run = function () {return name + age + ' running ... ';//Direct printing of parameters can}; return obj;} var box = box (' Lee ', 100); Alert (Box.run ());PS: The safe constructor is similar to parasitic. Inheritance inheritance is a relatively central co

function ends? (3) definition of Class const member variables class desk{const int price;public:desk():price(10){}~desk() {}}; The const member variable adds the const keyword before the class variable definition. Unlike common member variables, const variables must be initialized in constructors. If there is no const keyword, it doesn't matter whether Initialization is required within the constructor.

I. TheoryFIFO: Advanced first-out scheduling algorithmLRU: The most recent unused scheduling algorithmBoth are cache scheduling algorithms, which are often used as memory page replacement algorithms.Make an analogy to help you understand. You have a lot of books, say 10000. Because you have so many books, you can only put them in the basement. You don't read in the basement while you are reading, you read in the study. Every time you want to read, you have to go to the basement to find the book

There are also many occupations that require training in the neck, such as desk workers. If the desk worker does not carry on the neck training, the cervical vertebra degeneration or the cervical spondylosis disease incidence is more than 80%. For example, writing workers, computer workers, drivers and other desk workers are high-risk groups of cervical spondylos

the elevator with you may be a friend of your boss, an important customer. You can praise the company, but do not say anything that is opposed or dissatisfied in the elevator. Otherwise, you will not know why you have died so quickly.14. Is your desk professional?At present, most foreign companies use a small grid of desks. Maybe you think my desk is a private place, and you can put anything you want, but

your boss, an important customer. You can praise the company, but do not say anything that is opposed or dissatisfied in the elevator. Otherwise, you will not know why you have died so quickly. 14. Is your desk professional?At present, most foreign companies use a small grid of desks. Maybe you think my desk is a private place, and you can put anything you want, but please note, the

desk professional?At present, most foreign companies use a small grid of desks. Maybe you think my desk is a private place, and you can put anything you want, but please note, the desk is also a place that shows your value, so you need to make your desk professional. What kind of