How JavaScript determines the length of a string (1 characters in English, 2 characters for Chinese characters)

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

Method One:

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:

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:

var jmz = {};  
Jmz. GetLength = function (str) {  
    ///<summary> gets the actual length of the string, Chinese 2, English 1</summary>  
    ///<param name= "str" > to get the length of the 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;  
};

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Method Four:

var L = str.length;   
var blen = 0;   
For (i=0 i<l; i++) {   
if (str.charcodeat (i) & 0xff00)!= 0) {   
Blen + +;   
}   
Blen + +;   
}

Method Five:

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

Getblen = function (str) {  
    if (str = null) return 0;  
    if (typeof str!= "string") {  
        str = "";  
    }  
    Return Str.replace (/[^\x00-\xff]/g, "a"). Length;
}

Author: csdn blog Micro WX Smile