Programming VIP

Warehouse address: Laotang / data visualization-211025 Project presentation address: Document User name: admin Password: 123456 Interface document address: dashboard Interface root path: http://www.itcbc.com:8000 Required technologies: Ajax, jQuery, echarts (third-party chart Library), third-party form verification plug-in, third-party prom ...

1,Number 1-1 properties MAX_VALUE JS is the largest number that can be representedMIN_VALUE JS is the smallest number that can be represented 1-2 method toFixed(length) specifies the decimal of the reserved lengthtoExponential() is represented by scientific countingtoPrecision(length) requires the number to display integer + decimal acc ...

1, Deconstruction assignment of array ES6 allows you to extract values from arrays and objects according to a certain pattern and assign values to variables, which is called structure. Previously, assigning values to variables can only be assigned directly; let a =1;let b =2;let c=3; In ES6, it can be written as: let [a,b,c] = [1,2,3]; You c ...

WedgepostMessage It is commonly used in embedded iframe or Web Workers for cross page (thread) message communication. Similar shadows can be seen in some other development environments, such as Chrome plug-in environment, Electron environment, sigma plug-in, etc.In recent work, we often deal with iframe and Web Workers, deal with pages and embe ...

1, Background & & roleAbnormal monitoring systemCollection exceptionCollect log information; Interface duration informationTimely warning; Send mailDisplay statisticsHigh cost of code review; Sometimes only syntax or code style problems can be found; There is not much time for deep reading of logical business problemsCompatibility probl ...

background Before introducing Hooks, let's first talk about the creation methods of React components. One is class components and the other is pure function components. Moreover, the React team hopes that the components will not become complex containers, and it is better to just be the pipeline of data flow. Developers can combine pipelin ...

(46 - Chapter III 20218 + a1043) grammar Case sensitive ECMAScript is case sensitive. identifier An identifier is the name of a variable, function, property, or function parameter. An identifier consists of one or more of the following characters: The first character must be a letter, underscore () Or dollar sign ($);The remainin ...

The backend API interface is in this file, and the request path is known by the backend definition List of fixed contents for each column (antd) About render parameters Later, I'll verify these three parameters myself, and I don't know the difference between text and record. text and record are identical. console.log(text === record ...

1.JS usage: A. Tag: < script > < / script > B. Tags can be placed in the head or body. When in the body, the script should be placed at the bottom of the < body > element to improve the display speed, because Script Compilation will slow down the display. C. Default attribute: < script type = "text / JavaScript&q ...

catalogue preface 1. Restrict a prop to a list of types 2. Use quotation marks to listen for nested attributes 3. Know when to use v-if 4. Abbreviation for a single scope slot 5. Mix local and global style s 6. Override styles for subcomponents 7. How to create a responsive variable outside Vue 8. Deconstruction in v-for 9. Cycle with ...