js intercepts string length (Chinese, English)

js intercepts the length of the string. When intercepting, the Chinese is calculated as 2 bytes.

function worldLimit(className, factLength){

$('.'+className).each(function(){
var content = $(this ).text();
var allLength = 0;
for (var i = 0; i < content.length; i++) {
var c = content.charCodeAt(i);
//Single byte plus 1
if ((c >= 0x0001 && c <= 0x007e) || (0xff60 <= c && c <= 0xff9f)) {
                                                                                                         1
                                                                                                                                                                                                                                    0; i < content.length; i++) {
        var c = content.charCodeAt(i);
                                                                                                                                                                           subLength++ )
                                                                                                                                                                                 
              }
}
                 $(this).text(subContent);