javascript void 0 The webpage cannot be opened

In recent years, many people may encounter a confusing situation when browsing the web using electronic devices - when opening a web page, they can only see "javascript:void(0)" words, and the page cannot load properly. Although this situation is very annoying, it is not actually magic or black technology. The reason is relatively simple. This article will introduce in detail the causes, solutions and how to avoid related problems of "javascript:void(0)" from the following aspects.

1. What is "javascript:void(0)"?

First of all, we need to know what "javascript:void(0)" means. In web development, JavaScript (JS for short) is a scripting language that allows web pages to interact with users, such as real-time pop-up windows, page effect rendering, form validation, etc. In the process of using JavaScript in web pages, it is often necessary to use hyperlink (anchor) tags. And when "javascript:void(0)" appears in a hyperlink, it is actually a way of linking, that is, "when this link is clicked, execute a javascript function, but do not perform any operations and jump to other pages." .

2. Why does "javascript:void(0)" appear?

So, what causes "javascript:void(0)" to appear in web pages? Usually there are the following situations:

1. JavaScript errors

In most cases, "javascript:void(0)" is caused by the web page containing errors. Caused by JavaScript statements. When the browser executes these incorrect statements, it may cause the page to fail to load normally and display "javascript:void(0)" in the link. For example, in the following code, when the "Require a date" link is clicked, "javascript:void(0)" will appear:

<a href="javascript:date()">需要一个日期</a>

<script type="text/javascript">
    function date(){
        var my_date = new Date();
        alert(my_date.toLocaleDateString());
    }
    dat();
</script>

In the above code, the error is that the function name in the last line is written as " dat" instead of "date", which results in the JavaScript statement being unable to be executed and "javascript:void(0)" being displayed in the link.

2. Not being bound to the hyperlink correctly

Sometimes "javascript:void(0)" appears in a hyperlink because it doesn't Be correctly bound to the hyperlink. Generally, the way to bind a JavaScript function to a hyperlink is to use the "onclick" event. When you bind a function to the "onclick" event, the browser will execute the JavaScript code when the link is clicked. If there are incorrect statements in the JavaScript code, the page will not load properly and "javascript:void(0)" will be displayed.

3. Need to prevent page jumps

In some specific situations, "javascript:void(0)" may be useful. For example, when the user does not complete the form or enters incorrectly, especially when it is necessary to prevent page jumps, this method can avoid the loss of the information filled in by the user. In this case, although the page loads with "javascript:void(0)" in the link, it is a user-friendly experience.

3. How to solve the "javascript:void(0)" problem?

Since "javascript:void(0)" appears in the browser, it means that there is an error in the JavaScript code, so how do we solve it? Here are several commonly used methods for your reference:

1. Check JavaScript code

First, we need to check whether the JavaScript code is correct. We can find errors through the console (Console), which will display JavaScript syntax errors, undefined variables and other error messages. By fixing these errors, you can avoid "javascript:void(0)" situations in your web pages.

2. Check whether the hyperlink is correctly bound

If there are no errors in the JavaScript statement, you need to check whether the hyperlink is correctly bound to the JavaScript function. You can use the following code template to check:

<a href="javascript:function_name()">Link</a>

It should be noted that the "javascript:function_name()" written in the "href" attribute should be enclosed in single quotes, and it needs to be added between the function names A pair of parentheses "( )".

3. Standardize JavaScript code style

In order to make JavaScript easier to maintain and read, we need to adhere to standard JavaScript code style, use appropriate white spaces and short variable names , write code that is easy to understand. This can prevent us from confusing and unpredictable problems when writing code, such as incorrect spelling of variable names, missing defined variables, etc.

4. How to prevent the "javascript:void(0)" problem?

Although we can take the above methods to solve the "javascript:void(0)" problem, in order to better prevent its occurrence, we can strengthen measures from the following aspects:

1. Write high-quality JavaScript code

Write high-quality JavaScript code and avoid errors as much as possible, which can effectively reduce the frequency of "javascript:void(0)" in links .

2. Use developer tools

Developer tools can detect syntax errors in real time during the development process to avoid error codes and "javascript:void( 0)" appears in the link.

3. Keep updated at any time

Timely update the JavaScript code and third-party libraries on the web page to avoid compatibility issues and avoid "javascript:void(0)" caused by problems with old and new versions "question.

When we use electronic devices to browse the web every day, "javascript:void(0)" appears when opening a certain page, which is really confusing. However, we have given detailed solutions and preventive measures. I believe that after reading this article, you will be able to better understand the causes of "javascript:void(0)" and adopt corresponding solutions to make Browse the web more smoothly on your electronic device.

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