JS Judge string Length (Chinese length is 2, English length is 1)

Purpose: To calculate the length of a string (1 characters in English, 2 characters in Chinese character)

Method One:

function () {    var len = 0;      for (var i=0; i<this. Length, i++) {      if (this). charCodeAt (i) ==94) {         + =2       ; Else  {         ++;       }     }     return len;  }

Method Two:

functionstrlen (str) {varLen = 0;  for(vari=0; i<str.length; i++) {      varc =str.charcodeat (i); //single byte plus 1     if((c >= 0x0001 && C <= 0x007e) | | (0xff60<=c && c<=0xff9f) ) {len++; }      Else{len+=2; }     }     returnLen;}

Method Three:

varJMZ ={};jmz. GetLength=function(str) {///<summary> Get string actual length, Chinese 2, English 1</summary>  ///<param name= "str" > string to get length </param>  varReallength = 0, Len = str.length, charcode = 1;  for(vari = 0; i < Len; i++) {CharCode=str.charcodeat (i); if(charcode >= 0 && charcode <=) Reallength + = 1; ElseReallength + = 2; }  returnreallength;};

Method Four:

var l =var blen = 0for (i=0; i<l; i++if (( Str.charcodeat (i) & 0xff00)! =0+ + +;}

Method Five:

Replace the double-byte with two single-byte and then get the length

function (str) {  ifnullreturn 0;   if (typeof str! = "string")    {+ = "";  }   return str.replace (/[^\x00-\xff]/g, "n"). Length;

JS Judge string Length (Chinese length is 2, English length is 1)