Javascript realizes the conversion of full-width and half-width characters_javascript skills

First code, then talk nonsense^_^

Copy code The code is as follows:

/**
* Convert full-width characters
​*/
function toDBC(str){
var result = "";
var len = str.length;
for(var i=0;i {
      var cCode = str.charCodeAt(i);
//The difference between full-width and half-width (except spaces): 65248 (decimal)
cCode = (cCode>=0x0021 && cCode<=0x007E)?(cCode 65248) : cCode;
​​​​ //Handle spaces
cCode = (cCode==0x0020)?0x03000:cCode;
         result = String.fromCharCode(cCode);
}
Return result;
}
/**
* Convert half-width characters
​*/
function toSBC(str){
var result = "";
var len = str.length;
for(var i=0;i {
      var cCode = str.charCodeAt(i);
//The difference between full-width and half-width (except spaces): 65248 (decimal)
cCode = (cCode>=0xFF01 && cCode<=0xFF5E)?(cCode - 65248) : cCode;
​​​​ //Handle spaces
cCode = (cCode==0x03000)?0x0020:cCode;
         result = String.fromCharCode(cCode);
}
Return result;
}

Knowledge Points

By comparing half-width characters and full-width characters (ASCII characters), we can find that there are full-width and half-width ASCII character ranges: 0x20~0x7E.

For example:

Symbols half-width and full-width differ
# 0x0023 0xFF03 0xFEE0
? 0x003F 0xFF1F 0xFEE0
Space 0x0020 0x03000 0x2FE0

Except for spaces, the difference between full-width and half-width characters is: 0xFFE0

Therefore, when converting full-width and half-width characters, special treatment of spaces is required.

For example:

Full-width = half-width 0xFEE0

Half-width = full-width - 0xFFE0