Programmer Think

Mufeng GEE series column It covers ecological environment, satellite remote sensing, climate change and cloud computing. Google Earth Engine series learning notes (I)Google Earth Engine series learning notes (II)Gee scholars visual time series agricultural landscapeSupervised classification of satellite images based on GEE scholars machine le ...

For the concept of class class, I believe people who have learned programming should see more of it. It is not surprising that it has been implemented in other programming languages for a long time, but not in JavaScript language. For a long time, developers have used function and prototype prototype to simulate class class and realize object-o ...

Operators and Expressions Floating point number There will be precision problems. It is recommended not to directly use floating-point numbers to participate in the operation.  console.log(0.1+0.2);//0.30000000000000004        console.log(0.07*100);//7.000000000000001        //You cannot directly judge whether two floating-point numbers a ...

1. Create a String object var strOb = new String("abcefg"); ​ var strOb = String("abcefg"); ​ var strOb = "abcefg"; Summary: any data type, as long as it is enclosed in quotation marks, is a string object 2. String properties stringObj.length (String length) 3. Method 3.1) substring position indexOf(string,[index]) / / returns the first ...

vue3 implements the response expression through Proxy+Reflect, and vue2 implements it through definePropertyProxyWhat is ProxyProxy is a class added in ES6 to represent proxy.If we want to listen to the operation process of the object, we can first create a proxy object, and then all operations on the object are completed by the proxy object. T ...

preface At the beginning of his life, his parents urged him, and his physical condition was much worse than before, so he took this opportunity to meet another object, See below! 1, My object criteria I need to check the object's emotional experience, family status, personal ability and whether it is supported by elders Please look ...

signal communication Before introducing the application communication of "qiankun", we need to understand how the micro front-end architecture divides sub applications. In the micro front-end architecture, we should divide the corresponding sub applications by business, rather than dividing the sub applications by functional modules ...

1, Introduction to Express framework In the previous Node basics, we learned Node JS, although you know how to use Node The HTTP module in JS can develop Web applications, deal with static resources, deal with dynamic resources, request distribution (routing), etc. it can also make developers understand the HTTP protocol more clearly, but it i ...

If you want to understand data broker, you need to understand a method. This method is on Object. The name of the method is defineproperty(). It is used in many places (such as data hijacking in vue, data broker, and the bottom layer of computing properties) Define; Property property; So this defineproperty method is used to add properties (or ...

Hello, I'm A bowl week , a front end that doesn't want to be drunk. If you are lucky enough to get your favor, I am very lucky~ summary What is the prototype In JavaScript, a Function is an object of type Function that contains properties and methods. The Prototype is an attribute of a Function type object. The function definition contain ...