jquery converts numbers into Chinese characters

As web development becomes more and more mature, front-end technology is also constantly evolving. As one of the most popular front-end frameworks, jQuery has a huge community and excellent documentation, and has become an indispensable tool for web developers. One of the indispensable tools. Today we will discuss the function of converting numbers into Chinese characters in jQuery.

Converting numbers into Chinese characters is a relatively practical function and is often used in financial systems and other application systems. In Web front-end development, numbers are often converted into Chinese characters to represent prices, awards, etc., such as "500 yuan", "third prize", "1,011 yuan". Using jQuery to convert numbers into Chinese characters only requires a few lines of code and does not require too complex algorithms. Below we will introduce the specific implementation method.

First of all, we need to clarify a concept, that is, the rules for converting numbers into Chinese characters. Chinese character numbers are decimal, and the counting method shown in the table below is generally used.

## 0 Zero〇##123456##7淒七8八八9玖九 Before converting numbers into Chinese characters, we must first determine whether the entered numbers meet the requirements. There are many ways to achieve this. We will use regular expressions to determine whether the input is correct. The regular expression is as follows:

function isNumber(value){
    var reg = /^[1-9]d*$|^0$/;
    return reg.test(value);
}

Number	Version one	Version two
一	一
二	二
三	三
四	四
五	五
鲁	六

Among them, ^ in the regular expression means matching the beginning, $ means matching the end, [1-9] means matching numbers 1 to 9, d means matching any number, * means matching 0 or more, | means or, there is only one 0, i means case-insensitive. Through this regular expression, we can ensure that the entered numbers meet the requirements.

Next, we will implement the core code for converting numbers into Chinese characters. We can save numbers and Chinese characters in an array, and select the corresponding Chinese characters based on the numbers. The code is as follows:

function toChineseNumber(number) {
    if(!isNumber(number)) {
        return '请输入正确的数字！';
    }

    var CN = ['', '十', '百', '千', '万', '亿', '兆'];//中文数字单位
    var CHN_NUM = ['零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖'];//中文数字名称
    var num = parseInt(number);
    var result = '';
    var zero = true;//是否补零
    var pos = 0;//单位下标
    var len = CN.length;//单位长度

    if(num === 0) {
        return CHN_NUM[0];//如果是0就返回零
    }
    while(len-- > 0) {
        var quotient = Math.floor(num / Math.pow(10, len)) % 10;//获取数字
        if(quotient === 0) {
            if(!zero) {
                zero = true;//置0
                result += CHN_NUM[0];//加零
            }
        } else {
            zero = false;//取消加零标志
            result += CHN_NUM[quotient] + CN[len];//加数字和单位
        }
        pos++;//移动单位下标
    }
    if(result.lastIndexOf('零') === result.length - 1) {//去除尾部0
        result = result.substring(0, result.length - 1);
    }
    return result;
}

Explain this code. First, in the toChineseNumber function, it is judged whether the entered number meets the requirements. If not, the prompt "Please enter the correct number!" is returned. Then two arrays are defined, CN is used to save the unit of the number, and CHN_NUM is used to save the name of the number. Use the parseInt function to convert the input number into an integer, and then define some variables. zero is used to record whether zero needs to be added, pos is used to record the subscript of the unit, and len represents the length of the CN array.

In the while loop, first use the Math.pow(10, len) function to find the number of digits in the current number, and then use Math.floor(num / Math.pow(10,len)) % 10 Get the value of the current bit. If this value is 0, it means that the current bit is zero, and the zero flag needs to be set to true, which means that zeros need to be added before the number. If this value is not 0, then zero needs to be set to false, indicating that there is no need to add zeros in front. Find the corresponding Chinese character in the array based on the number, and add the unit corresponding to the number (if it is 0, ignore it, if it is not 0, add the corresponding unit). Then pos is subscripted by 1 until all digits are exhausted.

Finally, you need to remove the trailing zeros from the result and then return the result. This completes all operations of converting numbers into Chinese characters.

At this point, the method of converting numbers into Chinese characters using jQuery is completed. The whole process is very simple and easy to understand, and only requires a few lines of code to implement. In actual web development, we can use these codes according to our actual needs.

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