关于链接中href写javascript表达式出现的错误疑问？
原代码是这样的：返回 但是这个却在控制台报了个错，然后无法进行历史回退； 错误文本：Uncaught SyntaxError: Illegal return statement 请问下前端大神们，这个是什么问题，貌似链接的href属性不能写return表达式，当然可以不这样写的，就是想知道为什么会出错，为什么href不能写return表达式 先谢谢了！
回复内容：
已有的两个回答都是错的。。。只好冒出来回答一下。。。童鞋你们这样不求甚解真的好吗。。。要深刻认识到，以下两种代码看起来像，但是实际作用原理完全不同：
A类（href）：
<span class="nt"><a</span> <span class="na">href=</span><span class="s">"javascript:your_code_here"</span><span class="nt">></span> A Link <span class="nt"></a></span>
错误原因是：当在非函数语句中执行"return"语句时，会被js认为是非法语句
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Detailed explanation of the usage of return in C language
Oct 07, 2023 am 10:58 AM
The usage of return in C language is: 1. For functions whose return value type is void, you can use the return statement to end the execution of the function early; 2. For functions whose return value type is not void, the function of the return statement is to end the execution of the function. The result is returned to the caller; 3. End the execution of the function early. Inside the function, we can use the return statement to end the execution of the function early, even if the function does not return a value.
What do src and href mean?
Aug 16, 2023 pm 05:00 PM
src and href are respectively, 1. src is the abbreviation of source, which is used to specify the path of external resources. It is usually used to embed external files, such as pictures, audios, videos, etc. The src attribute is generally used on img, script, iframe and other tags. ; 2. href is the abbreviation of hypertext reference, which is used to specify the path of the target resource of the hyperlink. It is usually used to link to external documents or other pages. The href attribute is generally used on tags such as a and link.
What is the execution order of return and finally statements in Java?
Apr 25, 2023 pm 07:55 PM
Source code: publicclassReturnFinallyDemo{publicstaticvoidmain(String[]args){System.out.println(case1());}publicstaticintcase1(){intx;try{x=1;returnx;}finally{x=3;}}}#Output The output of the above code can simply conclude: return is executed before finally. Let's take a look at what happens at the bytecode level. The following intercepts part of the bytecode of the case1 method, and compares the source code to annotate the meaning of each instruction in
How to solve Python error: SyntaxError: invalid syntax
Aug 17, 2023 pm 07:36 PM
How to solve Python error: SyntaxError: invalidsyntax In the process of programming in Python, you often encounter various errors. Among them, "SyntaxError: invalid syntax" is a common error. It usually indicates the occurrence of a code that does not conform to Python syntax rules. This article will introduce some common causes of "SyntaxError: inv
How to solve 'SyntaxError: Unexpected token' in Vue application?
Jun 24, 2023 pm 06:55 PM
How to solve "SyntaxError:Unexpectedtoken" in Vue application? Vue is a JavaScript framework widely used in front-end development. It allows us to more easily manage the state, rendering and interaction of the page. However, when writing Vue applications, sometimes you will encounter the "SyntaxError: Unexpectedtoken" error. This error message means that there is a syntax error in the code. The JavaScript engine
Solution to syntaxerror when running Python
Dec 04, 2023 pm 01:44 PM
Solution to syntaxerror when running Python: 1. Check the code syntax; 2. Use the help of the IDE or code editor; 3. Check the error message; 4. Use Python's compile() function; 5. Make sure to use the correct Python version; 6 , Consider using static code analysis tools; 7. View documentation; 8. Use a debugger; 9. Rewrite or simplify the code; 10. Consider using type annotations; 11. Check third-party libraries or dependencies; 12. Ensure that environment variables are set correctly etc.
What are the differences in functions and usage between the src attribute and the href attribute?
Dec 28, 2023 am 08:20 AM
The src attribute and href attribute are commonly used attributes in HTML and are used to load external resources. Although they have similar purposes, there are some differences in usage and purpose. src attribute: The src attribute is used to specify external resources to be embedded in the document. It is mainly used to introduce external script files and media files into HTML documents. It can be used in the following situations: Introduce external JavaScript files: Link external JavaScript files to HTML pages through the src attribute.
Detailed explanation of JavaScript function return values and return statements
Aug 04, 2022 am 09:46 AM
JavaScript functions provide two interfaces to interact with the outside world. The parameters serve as the entrance to receive external information; the return value serves as the outlet to feed back the operation results to the outside world. The following article will take you to understand the JavaScript function return value and briefly analyze the usage of the return statement. I hope it will be helpful to you!
