JavaScript implements converting numbers into Chinese_javascript skills
var _change = { ary0:["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"], ary1:["", "十", "百", "千"], ary2:["", "万", "亿", "兆"], init:function (name) { this.name = name; }, strrev:function () { var ary = [] for (var i = this.name.length; i >= 0; i--) { ary.push(this.name[i]) } return ary.join(""); }, //倒转字符串。 pri_ary:function () { var $this = this var ary = this.strrev(); var zero = "" var newary = "" var i4 = -1 for (var i = 0; i < ary.length; i++) { if (i % 4 == 0) { //首先判断万级单位,每隔四个字符就让万级单位数组索引号递增 i4++; newary = this.ary2[i4] + newary; //将万级单位存入该字符的读法中去,它肯定是放在当前字符读法的末尾,所以首先将它叠加入$r中, zero = ""; //在万级单位位置的“0”肯定是不用的读的,所以设置零的读法为空 } //关于0的处理与判断。 if (ary[i] == '0') { //如果读出的字符是“0”,执行如下判断这个“0”是否读作“零” switch (i % 4) { case 0: break; //如果位置索引能被4整除,表示它所处位置是万级单位位置,这个位置的0的读法在前面就已经设置好了,所以这里直接跳过 case 1: case 2: case 3: if (ary[i - 1] != '0') { zero = "零" } ; //如果不被4整除,那么都执行这段判断代码:如果它的下一位数字(针对当前字符串来说是上一个字符,因为之前执行了反转)也是0,那么跳过,否则读作“零” break; } newary = zero + newary; zero = ''; } else { //如果不是“0” newary = this.ary0[parseInt(ary[i])] + this.ary1[i % 4] + newary; //就将该当字符转换成数值型,并作为数组ary0的索引号,以得到与之对应的中文读法,其后再跟上它的的一级单位(空、十、百还是千)最后再加上前面已存入的读法内容。 } } if (newary.indexOf("零") == 0) { newary = newary.substr(1) }//处理前面的0 return newary; } } //创建class类 function change() { this.init.apply(this, arguments); } change.prototype = _change //创建实例 var k = new change("00102040"); alert(k.pri_ary())

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

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.


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