How to convert a non-JSON format string to an object in Vue.js?

Vue.js cannot directly process data conversion, and it is necessary to write parsing functions according to different string formats. The easiest way is to use the split() method and regular expression of the string, such as: function parseString(str) {const pairs = str.split(',');const obj = {};pairs.forEach(pair => {const [key, value] = pair.split('=').map(item => item.trim());obj[key] = value;});re

How to turn messy strings into objects in Vue.js?

Many times, the data returned by the backend is not a standard JSON, but some kind of weird string, such as a comma-separated key-value pair, or other custom formats. This can be a headache in Vue.js applications. Use JSON.parse() directly? Haha, wait for an error. So, this article will talk about how to solve this problem gracefully and avoid falling into those crazy pits.

Let’s talk about the basics first. Vue.js itself does not directly handle data conversion, it is mainly responsible for the rendering and data binding of views. Data processing is usually done in the methods or computed properties of the Vue instance. It is important to understand this, don't expect Vue.js to automatically help you turn junk strings into objects.

The core is: you need to write the corresponding parsing function according to the specific format of the string. There is no universal solution, it all depends on the "unidentified object" spit out from the back end.

Suppose we receive such a string: name=John Doe,age=30,city=New York

The easiest way is to use the split() method and regular expression of the string:

 <code class="javascript">function parseString(str) { const pairs = str.split(','); const obj = {}; pairs.forEach(pair => { const [key, value] = pair.split('=').map(item => item.trim()); // 注意trim()，去除空格obj[key] = value; }); return obj; } let myString = "name=John Doe,age=30,city=New York"; let myObject = parseString(myString); console.log(myObject); // Output: { name: 'John Doe', age: '30', city: 'New York' } //在Vue组件中使用//data(){ // return{ // myData: '' // } //} //mounted(){ // fetch('/api/data') // .then(res => res.text()) // .then(data => { // this.myData = parseString(data) // }) //}</code>

This code first splits the string with a comma, and then splits each key-value pair with an equal sign. trim() is very important, it can remove unnecessary spaces and avoid some weird problems.

However, this is just the simplest example. If your string format is more complex, such as nested structures or other special characters, you need more complex regular expressions or more powerful parsing libraries, such as lodash 's _.split() or other libraries that specialize in string processing.

Remember, regular expressions are a double-edged sword. Simple regular expressions are easy to write, but complex regular expressions can make you doubt your life if you debug it. So, unless you are very skilled in regular expressions, try to avoid writing too complicated rules. If the format is too complicated, consider letting the backend directly return data in JSON format, this is the most reliable solution.

In terms of performance, for small data volumes, the above method is sufficient. But if the data volume is large, you need to consider optimization, such as using more advanced parsing libraries, or asynchronous processing.

Finally, a good code style and comments are crucial. Writing code is like writing an article, with clear structure and comments that allow you (and your colleagues) to understand what the code is doing in a few months. Don’t be lazy and develop good programming habits. Your future self will be grateful to you.

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