Decode encoded URL using decodeURIComponent function in JavaScript

Use the decodeURIComponent function in JavaScript to decode an encoded URL

URL encoding is to convert special characters in the URL into a specific encoding format to ensure that the Special characters are passed and parsed correctly. Decoding is to restore these encoded characters back to the original characters.

In JavaScript, we can use the decodeURIComponent function to decode the URL. The following is a specific code example:

// 编码的URL
var encodedURL = "https%3A%2F%2Fexample.com%2F%3Fq%3Djavascript%26id%3D123";

// 使用decodeURIComponent函数解码URL
var decodedURL = decodeURIComponent(encodedURL);

// 输出解码后的URL
console.log(decodedURL);

After running the above code, the decoded URL will be output: "https://example.com/?q=javascript&id=123".

In the example, we first define an encoded URL (encodedURL), in which the special characters are converted into a specific encoding format. Then, we use the decodeURIComponent function to decode the encoded URL and restore it back to the original characters. Finally, use the console.log function to output the decoded URL (decodedURL).

It should be noted that the decodeURIComponent function can only decode URLs encoded using the encodeURIComponent function. If the URL has not been encoded by encodeURIComponent, no decoding operation is required.

Summary:

The decodeURIComponent function in JavaScript is used to decode the encoded URL and restore it back to the original characters. Use this function to ensure that special characters in the URL are passed and parsed correctly. In practical applications, we often encounter situations where we need to deal with URL encoding, so it is very important to be proficient in the use of the decodeURIComponent function.

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