js calculates the length of a string and the Chinese contained in it is in utf8 format_javascript skills

Method 1:

Copy code The code is as follows:

function byteLength(str) {
var byteLen = 0, len = str.length;
if( !str ) return 0;
for( var i=0; i byteLen = str.charCodeAt(i) > 255 ? 2 : 1;
return byteLen;
}

Description: byteLength(str)
Parameter:
string str: The string to calculate the byte length (non-ASCII characters count as 2 bytes)

Method 2:

JS gets the actual length of the string!

Another little thing added today! A string length detection method that programmers often use, because the original length of JS in Chinese and English is the same as one character. So here you have to judge and get the actual length of the string.

Copy code The code is as follows:

function GetLength(str) {
///

Get the actual length of the string, Chinese 2, English 1

///To get the length of the string
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;
};

Execution code:

alert(GetLength('Test test ceshiceshi));

Method 3: The test has not been passed yet

Copy code The code is as follows:

function getByteLen(val) {
var len = 0;
for (var i = 0; i < val.length; i ) {
if (val[i].match(/[u4e00-u9fa5 ]/ig) != null)
len = 2;
else
len = 1;
}
return len;
}

Method 4:

GBK length calculation function:

Copy code The code is as follows:

// GBK character set actual length calculation
function getStrLeng(str){
var realLength = 0;
var len = str.length;
var charCode = -1;
for(var i = 0; i < len; i ){
charCode = str.charCodeAt(i);
if (charCode >= 0 && charCode <= 128) {
realLength = 1;
}else{
                       // if For Chinese, add 2 to the length
realLength = 2;
}
}
return realLength;
}

UTF8 length calculation function:

Copy code The code is as follows:

// UTF8 character set actual length calculation
function getStrLeng(str){
var realLength = 0;
var len = str.length;
var charCode = -1;
for(var i = 0; i < len; i ){
charCode = str.charCodeAt(i);
if (charCode >= 0 && charCode <= 128) {
realLength = 1;
}else{
                       // if For Chinese, add 3 to the length
realLength = 3;
}
}
return realLength;
}