Javascript in English string interception

1 /**2 * Chinese and English string interception3 * @param str to intercept the string4 * @param len to intercept the length5 * @param hasdot whether to add ' ... ' at the end of the string6 * @returns {string}7   *8   */9           Ten functionmysubstring (str, len, Hasdot) { One         varNewlength = 0; A         varNewstr = ""; -         varChineseregex =/[^\x00-\xff]/G; -         varSinglechar = ""; the         varStrlength = str.replace (Chineseregex, "* *"). length; -          for(vari = 0;i < strlength;i++)     { -Singlechar =Str.charat (i). toString (); -           if(Singlechar.match (chineseregex)! =NULL) { +Newlength + = 2; -}Else { +newlength++; A           } at           if(Newlength >Len) { -              Break; -           } -Newstr + =Singlechar; -         } -         if(Hasdot && strlength >Len) { inNewstr + = "..."; -         } to         returnNewstr; +}

For example, if you need to keep a maximum of 24 characters (Chinese count two, English is one)

$ (' #inupt '). On (' KeyUp ',function(){    varNewValue = $ ( This). Val (); varTextLength = 0; varsubStr;  for(vari = 0; i < newvalue.length; i++) {      if(Newvalue.charat (i). Match (/[\u0391-\uffe5]/) ) {TextLength+ = 2; } Else{textLength++;    }    }; if(textlength>24) {subStr= Mysubstring (newvalue,24); $( This). Val (SUBSTR); }})

Javascript in English string interception