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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 ...

Three.js to achieve parabolic dynamic flow effect Old rules, let's first look at the final effect. This effect may be used in the demonstration from the beginning to the end of the aircraft route, the demonstration of missile launch trajectory effect and other scenes. After mastering the idea, the effect is very simple. There are actually two ...

0.1 + 0.2 = = = 0.3? Why? Unequal. In js, javascript uses the Number type to represent numbers (integers or floating-point numbers), following IEEE 754 Standard, a number (1 + 11 + 52) is represented by 64 bit binary: sign bit + exponential bit (order code) + tail code 1 sign bit, 0 for positive number, 1 for negative number s11 digits (e ...

variable target Be able to say the main role of variablesCan write the initialization of variablesBe able to say the naming convention of variablesCan draw how variables are stored in memoryBe able to write cases of exchange variables catalogue Variable overviewUse of variablesVariable syntax extensionVariable naming conventionExchange vari ...

1, First acquaintance with ES6 es6 compatibility view 1. let and const let, like var, is used to declare variables whose values can be changedconst is used to declare constants. Once a constant is initialized, it cannot be re assignedconst must be initialized when declared let name = 'toot toot' let age = 18 const sex = 'female' ...

Master Ajax in an hour Click jump for one hour to master Ajax video Life, one stop has one stop of scenery, one year has one year of taste, your age should be the medal of your life, not the reason for your sadness. What is AJAX? AJAX = Asynchronous JavaScript and XML. AJAX is a technology that can update some web pages without ...

Basic concepts Process is the program that the computer has run. Thread is the smallest unit that the operating system can schedule operations. It is included in the process Every Tab page in the browser opens a process, which contains many threads As we all know, JS is a single threaded language. If we encounter very time-consuming operations ...

When doing data analysis, we often hear the concepts of year-on-year and month on month. When publishing statistical data, enterprises and organizations usually like to compare the previous historical data with the year-on-year and month on month data to illustrate the changes of the data. For example, the Bureau of Statistics announced that in ...

A simple cool special effects page (html+css+js including source code) --- 3D image demonstration preface1, Page effect display2, Function description 1. Open the page and all pictures will rotate automatically2. The size and spacing of pictures can be changed as the mouse wheel scrolls3. Press and hold the mouse anywhere on t ...