JavaScript displays Chinese garbled characters

In the process of web development, we often encounter the problem of JavaScript displaying Chinese garbled characters. This is because JavaScript does not support directly reading Chinese characters, and the Chinese characters need to be converted into the corresponding Unicode encoding first. This article will introduce the solution to the problem that JavaScript displays Chinese garbled characters in web development.

1. Chinese character encoding

In the field of computer programming, Chinese characters are usually encoded in Unicode. The Unicode encoding corresponding to each Chinese character has two representations: decimal and hexadecimal. .

For example, the Unicode encoding of the Chinese character "中" can be represented as the decimal value 20013 or the hexadecimal value 4E2D. In JavaScript, u ​​plus the corresponding hexadecimal value can be used to represent Chinese characters.

2. JavaScript Chinese Character Conversion

In order to display Chinese characters correctly in JavaScript, we need to use the encodeURI() and decodeURI() methods of the String object for conversion. The specific usage method is as follows:

1.encodeURI() method

This method is used to convert Chinese characters in the string to Unicode encoding, for example:

var str = "中文字符";
var unicode = encodeURI(str);
console.log(unicode); //输出结果：%E4%B8%AD%E6%96%87%E5%AD%97%E7%AC%A6

In this In the code, the encodeURI() method converts the string "Chinese characters" into Unicode encoding and assigns the result to the variable unicode.

2.decodeURI() method

This method is used to convert Unicode encoding into corresponding Chinese characters, for example:

var unicode = "%E4%B8%AD%E6%96%87%E5%AD%97%E7%AC%A6";
var str = decodeURI(unicode);
console.log(str); //输出结果：中文字符

In this code, decodeURI() method Convert the Unicode encoding "Chinese Character" to the Chinese character "Chinese Character" and assign the result to the variable str.

3. Solution to garbled display of Chinese characters in JavaScript

In web development, we usually use Ajax technology for data interaction, so when garbled Chinese characters appear in the Ajax return results, we can use How to convert Unicode encoding to Chinese characters.

The sample code is as follows:

$.ajax({
    url: "example.com",
    type: "GET",
    success: function (result) {
        var unicode = result;
        var str = decodeURI(unicode);
        console.log(str); // 输出结果：中文字符
    },
    error: function () {
        console.log("请求失败");
    }
});

In this code, we first obtain the Unicode encoded string returned by the server through Ajax and assign it to the variable unicode. Then use the decodeURI() method to convert the Unicode encoding to Chinese characters and output the result to the console.

If there is a problem with Chinese characters displaying garbled characters in the HTML code of the page, we can use the meta tag to set the character set. For example, add the following meta tag in the HTML code:

<meta charset="utf-8">

This tag sets the character set of the page to UTF-8, which can avoid the problem of Chinese characters displaying garbled characters.

4. Conclusion

When JavaScript processes Chinese characters, it needs to convert the Chinese characters into Unicode encoding for operation, and then convert the Unicode encoding into Chinese characters for display. In web development, we can solve the problem of garbled Chinese characters by converting the Unicode encoding in the Ajax return result into Chinese characters. We can also use the meta tag to set the character set of the page to avoid the problem of Chinese characters displaying garbled characters.

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