IE5.5 starts to support the content transparency of floating frames. If you want to define transparent content for a floating frame, the following conditions must be met.
1. The allowTransparency tag attribute used with iframe elements must be set to true.
2. In the iframe content source document, the bgColor tag attribute of the background-color or body element must be set to transparent
<iframe src="./ads_top_tian.html" allowtransparency="true" style="background-color=transparent" title="test" frameborder="0" width="470" height="308" scrolling="no"></iframe>
Of course, the premise is that the color is not set in the iframe page.
In the above we mainly see the code style in style ="background-color=transparent" Through the following four ways of writing IFRAME, I think you should have a clear understanding of how to achieve the background transparency effect of iframe:
<IFRAME ID="Frame1" SRC="transparentBody.htm" allowTransparency="true"></IFRAME> <IFRAME ID="Frame2" SRC="transparentBody.htm" allowTransparency="true" STYLE="background-color: green"> </IFRAME> <IFRAME ID="Frame3" SRC="transparentBody.htm"></IFRAME> <IFRAME ID="Frame4" SRC="transparentBody.htm" STYLE="background-color: green"> </IFRAME>
Now let's look at an example
This example is mainly iframe The object's allowTransparency attribute is applied. When this attribute is set to true and the background color of the page loaded by the iframe is set to transparent, the iframe will be transparent.
allowTransparency sets or gets whether the object can be transparent.
bgColor sets or gets the background color of the object
Parent page
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>父页面</title> </head> <body bgcolor="#FF0000"> <iframe src="index.htm" allowTransparency="true"></iframe> </body> </html>
Child page
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>子页面</title> <style type="text/css"> body { background-color: transparent; } </style> </head> <body> </body> </html>
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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.

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.


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