Javascript implements a numerical addition function_javascript skills
No further nonsense, just give me the code
JS
<script type="text/javascript"> function Sum(arg1,arg2){ //数值加法函数 var sarg1 = new String(arg1); //将传入的参数转为字符串以便进行参数检查 var sarg2 = new String(arg2); //将参数2转为字符类型 if( (sarg1=="")||(sarg2=="") ) //确保参数不为空 { var e0 = new Error(); //当有参数为空则抛出异常 e0.Serial = 1000001; //错误编号 if( sarg1=="" ) //根据为空的参数正确填写错误信息 { e0.message = "Sum函数参数非法:第1个参数为空!"; //错误描述信息 } else { e0.message = "Sum函数参数非法:第2个参数为空!"; } throw e0; //抛出错误信息 } for(i=0;i<sarg1.length;i++){ //参数合法性检查 for(j=0;j<10;j++){ //检查所有字符 if(sarg1.charAt(i)==j) //若不是数字则抛出错误信息 { break; //跳出循环 } else { if(j==9) //当已经查询到数字9时 { var e1 = new Error(); //错误信息对象 e1.Serial = 1000001; //错误编号 e1.message = "Sum函数参数:" + sarg1 + "是非法数字!"; //错误描述信息 throw e1; } } } } for( k=0;k<sarg2.length;k++ ) //检查参数2是数字 { for(l=0;l<10;l++){ //从0到9逐一比较 if(sarg2.charAt(k)==l) //如果是0~9的数字 { break; } else { if(l==9) //只有包含非数字则抛出错误信息 { var e2 = new Error(); //创建错误对象 e2.Serial = 1000001; //异常编号 e2.message = "Sum函数参数:" + sarg2 + "是非法数字!"; throw e2; } } } } return Number(arg1) + Number(arg2); //参数都正确则返回两个值得和 } function Button1_onclick(){ //“计算”按钮的单机事件处理程序 try{ var Text1 = document.getElementById("Text1"); var Text2 = document.getElementById("Text2"); var Text3 = document.getElementById("Text3"); var sum = Sum(Text1.value,Text2.value); //调用函数进行计算 Text3.value = sum; //输出计算结果 } catch(e){ //有错误发生则输出错误信息 alert(e.message); //输出异常中的信息 if(e.Serail == 1000001) //如果是1000001号错误 { alert(e.message); e = null; } } } </script>
HTML:
<input type="text" id="Text1" style="width:84px" maxlength="20"/> + <input type="text" id="Text2" style="width:75px" maxlength="20"/> = <input type="text" id="Text3" style="width:69px"> <input type="button" id="Button1" value="计算" onclick="return Button1_onclick()" />
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The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.


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