JS Judge string Length (1 characters in English, 2 characters for Chinese characters)

Other do not know whether is usable, anyway the first certainly can use

Compute string Length (1 characters in English, 2 characters in Chinese) method one: [JavaScript] View plaincopy the code to see that it derives from my code slice String.prototype.gblen = function () {    
    var len = 0;    
             for (var i=0 i<this.length; i++) {if (This.charcodeat (i) >127 | | this.charcodeat (i) ==94) {    
         Len + 2;    
         else {len + +;    
} return len;  
    Method Two: [JavaScript] View plaincopy on the code to see that the snippet is derived to my Code piece function strlen (str) {var len = 0;   
    for (var i=0; i<str.length; i++) {var c = str.charcodeat (i); Single byte plus 1 if ((c >= 0x0001 && C <= 0x007e) | | (0xff60<=c && c<=0xff9f))   
     {len++;   
     else {len+=2;  
} return len;  
Method Three: [JavaScript] View plaincopy the code to see the snippet derived from the code slice var jmz = {}; Jmz. GetLength = function (str) {///<summary> Gets the actual length of the string, Chinese 2, English 1</summary>///<param name= "str" > to get  
 Length of String </param>   var reallength = 0, Len = str.length, charcode =-1;  
        for (var i = 0; i < len; i++) {charcode = Str.charcodeat (i);  
        if (charcode >= 0 && charcode <= 128) Reallength + = 1;  
    else Reallength = 2;  
return reallength;  
};   
Method four: [JavaScript] View plaincopy The code slice to derive my code slice var l = str.length;   
var blen = 0;   
For (i=0 i<l; i++) {if (Str.charcodeat (i) & 0xff00)!= 0) {Blen + +;   
} Blen + +; Method Five: Replace the double-byte with two single-byte and then get the length [JavaScript] View plaincopy the code to see the snippet derived to my code slice Getblen = function (str) {if (str = =  
    NULL) return 0;  
    if (typeof str!= "string") {str = "";  
Return Str.replace (/[^\x00-\xff]/g, "a"). Length;  
 }