5 ways to determine the length of a string in JS (distinguish between Chinese and English)_javascript skills

Purpose: Calculate the length of the string (English occupies 1 character, Chinese characters occupies 2 characters)

Method 1:

Copy code The code is as follows:

String.prototype.gblen = function() {
var len = 0;
for (var i=0; i if (this.charCodeAt(i)>127 || this.charCodeAt (i)==94) {
len = 2;
} else {
len ;
}
}
return len;
}

Method 2:

Copy code The code is as follows:

function strlen(str){
var len = 0;
for (var i=0; i var c = str.charCodeAt(i);
//Single byte plus 1
if (( c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
len ; > }
}
return len;
}

Method 3:

Copy code

The code is as follows: var jmz = {};jmz.GetLength = function(str) { ///

Get the actual length of the string, Chinese 2, English 1< /summary>

///String to get the length

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 4:

Copy code

The code is as follows: var l = str.length; var blen = 0; for(i=0; iif ((str.charCodeAt(i) & 0xff00) != 0) {

blen ;
}
blen ;
}

Method 5:
Place the double Replace the byte into two single-byte ones and then get the length

Copy the code

The code is as follows: getBLen = function(str) { if (str == null) return 0; if (typeof str != "string"){

str = "";

}
return str.replace(/[^x00-xff]/g,"01").length;
}

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