Javascript 일본어 전각 반각 - 길이 판단

Javascript 일본어 전각 반각 - 길이 판단

=> 아래의 내용을 그대로 사용하지는 못하고, 업무에 따라서, 커스터마이징 해서 사용하면 될 것 같다.

 

Javascript judges the length of Japanese full-width half-width

 Today I encountered the need to determine the number of full-width and half-width text input in the input box. For example, you can enter 10 full-width characters and 20 half-width characters. After searching on the Internet, there is an article about JavaScript , the focus is on converting strings into unicode encoding, and AS and Javascript have ready-made charCodeAt () function.

    Not all Unicode between 0-255 is 1 byte long! ! Moreover, the Japanese Kana has a half-width form (Unicode is 65377-65439, except 65381)! ! , Not only these are half-width, there are many characters also half-width! ! Therefore, it is impossible to judge whether it is in 0-255. 

     Considering that Unicode includes all kinds of characters from all countries, and these characters are full-width and half-width mixed, so there will not be a perfect JS method to check half-width characters. But because other characters are generally not used, most of the future work is on Japanese projects, so I still use the method of 0-255, then cut out some full-width, plus the verification of half-width Japanese, and write the following method For research use:

function calcUTFByte (str)
{
    var len = 0;
    for (var i = 0; i <str.length; i ++) {
        var temp = str.charCodeAt (i);
        if (temp> = 0 && temp <= 254) {
            //The following characters are full-width within 0-255
            if (temp == 162
                || temp == 163
                || temp == 167
                || temp == 168
                || temp == 171
                || temp == 172
                || temp == 175
                || temp == 176
                || temp == 177
                || temp == 180
                || temp == 181
                || temp == 182
                || temp == 183
                || temp == 184
                || temp == 187
                || temp == 215
                || temp == 247) {
                len + = 2;
            }
            len ++;
        } else if (temp> = 65377 && temp <= 65439) {
            if (temp == 65381) {
                len + = 2;
            }
            len ++;
        } else {
            len + = 2;
        }
    }//for end
    return len;
}

 

출처: https://titanwolf.org/Network/Articles/Article?AID=da79219f-f754-434b-acce-72ba7b862b44#gsc.tab=0 

Javascript judges the length of Japanese full-width half-width(Others-Community)

 

[그 외]

// 전각이면 true, 반각이면 false
function checkIsZenkaku(value) {
      for (var i = 0; i < value.length; ++i) {
        var c = value.charCodeAt(i);       
        if (c < 256 || (c >= 0xff61 && c <= 0xff9f)) {
          return false;
        }
      }
      return true;
    }