<code class="language-html"><input type="checkbox" name="ck">php <input type="checkbox" name="ck">mysql <input type="checkbox" name="ck">jquery <input type="checkbox" name="ck">java</code>
1. 获取单个checkbox选中项:
<code class="language-javascript">$("input:checkbox:checked").val() 或者 $("input:[type='checkbox']:checked").val(); 或者 $("input:[name='ck']:checked").val(); </code>
2. 获取多个checkbox选中项:
<code class="language-javascript">$('input:checkbox').each(function() { if ($(this).attr('checked') ==true) { alert($(this).val()); } }); </code>
3. 设置第一个checkbox 为选中值:
<code class="language-javascript">$('input:checkbox:first').attr("checked",'checked'); 或者 $('input:checkbox').eq(0).attr("checked",'true'); </code>
4. 设置最后一个checkbox为选中值:
<code class="language-javascript">$('input:checkbox:last').attr('checked', 'checked'); 或者 $('input:checkbox:last').attr('checked', 'true');</code>
5. 根据索引值设置任意一个checkbox为选中值:
<code class="language-javascript">$('input:checkbox').eq(索引值).attr('checked', 'true');索引值=0,1,2.... 或者 $('input:checkbox').slice(1,2).attr('checked', 'true'); </code>
6. 选中多个checkbox:
同时选中第1个和第2个的checkbox:
<code class="language-javascript">$('input:checkbox').slice(0,2).attr('checked','true'); </code>
7. 根据Value值设置checkbox为选中值:
<code class="language-javascript">$("input:checkbox[value='1']").attr('checked','true'); </code>
8. 删除Value=1的checkbox:
<code class="language-javascript">$("input:checkbox[value='1']").remove(); </code>
9. 删除第几个checkbox:
<code class="language-javascript">$("input:checkbox").eq(索引值).remove();索引值=0,1,2.... </code>
如删除第3个checkbox:
<code class="language-javascript">$("input:checkbox").eq(2).remove(); </code>
10.遍历checkbox:
<code class="language-javascript">$('input:checkbox').each(function (index, domEle) { //写入代码 }); </code>
11.checkbox全部选中
<code class="language-javascript">$('input:checkbox').each(function() { $(this).attr('checked', true); }); </code>
12.checkbox全部取消选择:
<code class="language-javascript">$('input:checkbox').each(function () { $(this).attr('checked',false); });</code>

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.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.


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