


The length of the article is often not so appropriate. If it is displayed at the original length, it may affect the layout or aesthetics of the web page. At this time, it is necessary to intercept certain strings according to the situation to adapt to the layout. However, when When you click a button, you can still expand all the content. Here is a detailed introduction to how to achieve this effect through an example. The code example is as follows:
<!DOCTYPE html> <html> <head> <meta charset=" utf-8"> <meta name="author" content="http://www.softwhy.com/" /> <title>字符串截取展开效果</title> <style type="text/css"> #thediv{ width:200px; margin:0px auto; } </style> <script type="text/javascript"> function cutStr(){ var odiv=document.getElementById("thediv"); var str=odiv.innerHTML; var ospan=document.createElement("span"); var olink=document.createElement("a"); ospan.innerHTML=str.substring(0,20); olink.innerHTML=str.length>20?"...":""; olink.href="###"; olink.onclick=function(){ if(olink.innerHTML=="..."){ olink.innerHTML="收起"; ospan.innerHTML=str; } else{ olink.innerHTML="..."; ospan.innerHTML=str.substring(0,20); } } odiv.innerHTML=""; odiv.appendChild(ospan); odiv.appendChild(olink); }; window.onload=function(){ cutStr(); } </script> <body> <div id="thediv">脚本之家欢迎您,个人的力量再强也只是一只强壮的而已,如果有分享和胸怀和合作的精神,那么就有可能活得巨大进步。</div> </body> </html>
The above code implements our requirements, intercepts the specified string, and ends with "...". When this ending is clicked, all text content can be expanded. The following is an introduction to the implementation process of this effect.
1. Implementation principle:
Create a span element and a element, then use the substring() function to intercept the specified string and set it as the content of the span element, and then determine whether the length of the original string is greater than the specified length. If it is greater, then a The content in the element is set to "...". Then clear the original div, and then add the span element and a element to the div, thus realizing the interception function. Register a time processing function for the a element. Clicking this button will execute the event processing function. This function first determines what state it is in. If it is in the collapsed state, then the content in the a element will be set to "collapse" , and put all the original characters into span, thus realizing expansion. If it is in the expanded state, then the characters are intercepted and the content in the a element is modified. The principle is roughly the same, you can refer to related readings.
The above content is the JavaScript that this article introduces to you to intercept a string of specified length. Click to expand the entire code. I hope you like it.

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

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.


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