**[Keqie] Report: Keqie.net advises everyone not to overly rely on JavaScript. Although JavaScript has many advantages, it also has certain defects and issues. Therefore, using JavaScript is not a perfect solution. Below, we will introduce a few drawbacks of JavaScript, hoping to raise awareness and serve as a warning. At the same time, we will introduce the jQuery JS framework, which is an excellent and well-developed framework.**
In the previous article, I briefly explained how to achieve a sliding-to-the-top effect using JavaScript. The HTML snippet that calls the JS code was modified twice by me. This time, we will use it as an example to explain why we should not completely depend on JavaScript and how to handle it. JavaScript is a great invention; it made web pages interactive. Everyone likes various page effects, so the use of JS has become increasingly widespread and even indispensable. However, you must remind yourself that although the vast majority of browsers support JavaScript, not all do.
1. **Original Version**
Clear, concise, and can achieve the sliding effect.
```html
Top
```
Since the action is exposed in the browser's status bar, if the function has many parameters or actions, a long string will appear, making it look awkward and unattractive.
2. **Modified Version 1**
To address this issue, I revised the code to hide the actual JS method being called. The updated code is as follows:
```html
Top
```
This solved the previous problem, as the status bar now only displays "javascript:void(0);", while still maintaining the sliding effect. The processing flow is as follows:
From the process, we can see another issue: both events are JavaScript actions. If JS is disabled or the browser does not support it, clicking the button will result in no response at all.
3. **Modified Version 2**
To accommodate browsers without JavaScript support, I revised the code again:
```html
Top
```
We need to understand the order of link handling after a click. First, the `onclick` event is triggered, followed by jumping to the link specified in `href`. Adding `return false;` at the end of `onclick` interrupts the process, preventing navigation to the link specified in `href`.
If the browser supports JavaScript, the process will scroll to the top and then interrupt; if the browser does not support JavaScript, the `onclick` method will not be executed, and the link anchor will directly jump back to the top (without the sliding effect but still returning to the top). The processing flow is as follows:
Now, the solution is fairly comprehensive, but it still isn't perfect. In more extreme cases, we can actually separate the JavaScript code from the page code, loading the page code during `document ready` or `onload`.
4. **Future Version**
I plan to completely separate the JS in the new template and will dedicate a separate post to discuss this approach, including what should be loaded during `document ready`. [www.keqie.com]
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This translation captures the essence of the original Chinese text while ensuring clarity and proper grammar in English.