


Pure JavaScript code to realize drawing unlocking on mobile devices_javascript skills
There is a screen unlocking application on mobile phone devices that I believe everyone is familiar with. On mobile devices, users can lock the device user interface by setting a lock pattern as a password. The lock interface is as shown in the figure below.
The rendering is shown below
JavaScript Code
<script> $("#gesturepwd").GesturePasswd({ backgroundColor:"#2980B9", //背景色 color:"#FFFFFF", //主要的控件颜色 roundRadii:50, //大圆点的半径 pointRadii:12, //大圆点被选中时显示的圆心的半径 space:60, //大圆点之间的间隙 width:480, //整个组件的宽度 height:480, //整个组件的高度 lineColor:"#ECF0F1", //用户划出线条的颜色 zindex :100 //整个组件的css z-index属性 }); $("#gesturepwd").on("hasPasswd",function(e,passwd){ var result; if(passwd == "1235789"){ result=true; } else { result=false; } if(result == true){ $("#gesturepwd").trigger("passwdRight"); setTimeout(function(){ //密码验证正确后的其他操作,打开新的页面等。。。 alert("Pattern is correct") },500); //延迟半秒以照顾视觉效果 } else{ $("#gesturepwd").trigger("passwdWrong"); //密码验证错误后的其他操作。。。 } }); </script>
The above code is also very simple. Pure js code realizes drawing unlocking on mobile devices. Of course, this is the core code. Others need to be used by friends according to their own needs. I hope sharing this article can help everyone.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing


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