JS intercept character length by byte instance 2

/* * param str to intercept the string * param L to intercept the byte length, note that the byte is not a character, a kanji two bytes * Return truncated string */function cutstr (str,l) {        var result = ' ',        strlen = str.length,//String length        Chrlen = str.replace (/[^\x00-\xff]/g, ' * * * '). length;//byte Lengths    if (chrlen<= L) {return str;}        for (Var i=0,j=0;i<strlen;i++) {        var chr = Str.charat (i);        if (/[\x00-\xff]/.test (CHR)) {            J + +;//ASCII code is 0-255, one character is a byte length        }else{            j+=2;//ASCII code is 0-255, A character is a length of two bytes        }        if (j<=l) {///after adding the current character, if the total byte length is less than or equal to L, the current character will be true + + at result +            + chr;        } else{//vice versa indicates that result is the nearest L value without splitting the character and returns the return result directly;}}    Use Case alert (CUTSTR ("Test 1 string haha", "ten"); Alert (Cutstr ("ABCDEFGHIGKLMN", 10));

JS intercepts character lengths by byte instance 2