When converting strings to objects in Vue.js, JSON.parse() is preferred for standard JSON strings. For non-standard JSON strings, the string can be encoded by regular expressions and reduce methods according to the format or decoded URLs before processing. Select the appropriate method according to the string format and pay attention to security and encoding issues to avoid bugs.

String to object in Vue.js: Don't be blinded by JSON.parse()!

Many newbies, even some veterans, encounter string-turning objects in Vue.js, and their first reaction is JSON.parse() . This is true, but it is like a Swiss Army knife, which is easy to use, but you have to know when it will hurt yourself. We broke this article and talked about the conversion of strings to objects. Not only did we teach you how to use JSON.parse() , but more importantly, we teach you to avoid the pitfalls it brings.

First of all, it must be clear that JSON.parse() only applies to standard JSON strings. What is a standard JSON string? It is a string that complies with JSON syntax specifications, such as "{\"name\":\"John Doe\",\"age\":30}" . If it looks like this, "name:John Doe,age:30" , JSON.parse() will directly report an error to you and spit out a bunch of error messages that make you feel overwhelmed.

What should I do if I encounter a non-standard JSON string? It depends on the specific format of the string. If the string is a key-value pair separated by a comma and the values ??are connected by an equal sign, such as "name=John Doe,age=30" , then JSON.parse() will stop. At this time, you can try the regular expression and reduce method:

 <code class="javascript">function stringToObject(str) { const pairs = str.split(','); return pairs.reduce((obj, pair) => { const [key, value] = pair.split('='); obj[key.trim()] = value.trim(); return obj; }, {}); } let myString = "name=John Doe, age=30, city=New York"; let myObject = stringToObject(myString); console.log(myObject); // Output: { name: 'John Doe', age: '30', city: 'New York' }</code>

This code first divides the string with a comma, then iterates over each key-value pair with reduce method, divides the key and value with an equal sign, and finally builds an object. Note that I added .trim() to remove spaces here, which is very important when processing user input and can avoid a lot of unnecessary trouble.

Although this method is flexible, it has strong dependence on string formats. If the string format changes slightly, the code will have to be changed. Moreover, the writing of regular expressions is also quite cumbersome, and it may be a bit difficult to maintain.

Let’s look at a more complex situation. If your string is in a form similar to a query parameter, such as name=John Doe&age=30&city=New York . This thing is just used above to kneel down, because is the URL encoding of the space. At this time, you need to decode first, and then use a method similar to the above:

 <code class="javascript">function urlStringToObject(str) { const pairs = decodeURIComponent(str).split('&'); return pairs.reduce((obj, pair) => { const [key, value] = pair.split('='); obj[key] = value; return obj; }, {}); } let urlString = "name=John Doe&age=30&city=New York"; let urlObject = urlStringToObject(urlString); console.log(urlObject); // Output: { name: 'John Doe', age: '30', city: 'New York' }</code>

Here I used decodeURIComponent() to decode URL-encoded strings. Remember, be sure to pay attention to security and encoding issues when handling user input or strings from the server. Don't underestimate these details, they are often the source of bugs.

So, which method to choose depends on your string format. JSON.parse() works with standard JSON strings, while custom functions work with strings in other formats. Remember, clear code and rigorous processing can avoid those crazy bugs. Don’t forget to test your code. You must take into account all situations, so that your program can be as stable as Mount Tai!

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