Length Fetch string Lengths
| The code is as follows |
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<script type= "Text/javascript" >
var str= "string byte length";
alert (str.length);
</script> |
In Chinese and English, one character is equivalent to 2 characters
Example 1
| The code is as follows |
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| <script type= "Text/javascript" >
A Chinese character is equivalent to 2 characters
function Get_length (s) {
var char_length = 0;
for (var i = 0; i < s.length; i++) {
var Son_char = S.charat (i);
encodeURI (Son_char). length > 2? Char_length + + 1:char_length + + 0.5;
}
return char_length;
}
function Cut_str (STBR, Len) {
var char_length = 0;
for (var i = 0; i < str.length; i++) {
var son_str = Str.charat (i);
encodeURI (SON_STR). length > 2? Char_length + + 1:char_length + + 0.5;
if (char_length >= len) {
var Sub_len = Char_length = = Len? I+1:I;
Return str.substr (0, Sub_len);
Break
}
}
}
Intercept 15 Words (30 characters)
CUT_STR (' AA ah ah ah ah ah oh ah ah ah ah K's AH yes ', 15);
</script> |
Example 2
| The code is as follows |
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var jmz = {};
Jmz. GetLength = function (str) {
<summary> get 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;
};
Execute code: Alert (JMZ. GetLength (' Test test Ceshiceshi '); |
Example 3
The two-byte character length is automatically computed as 2, and the character is taken as a single byte, as 2 is 1 characters or two letters, and 1 is a Chinese character or letter.
| The code is as follows |
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| <! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en"
"Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > <title></title>
<body>
<div id= ' jsdiv ' style= "border:1px solid #ccc" ></div>
<script type= "Text/javascript" >
Gets the true length of the string (two bytes converted to two single-byte)
function Getstractuallen (schars)
{
Return Schars.replace (/[^x00-xff]/g, "xx"). Length;
} Intercept fixed-length substring ssource for string Ilen length
function Getinterceptedstr (ssource, Ilen)
{
if (Ssource.replace (/[^x00-xff]/g, "xx"). Length <= Ilen)
{
return ssource;
} var str = "";
var L = 0;
var Schar;
for (var i=0; Schar=ssource.charat (i); i++)
{
str = Schar;
L + = (Schar.match (/[^x00-xff]/)!= null? 2:1);
if (l >= ilen)
{
Break
}
} return str;
}
var str1= "It is a function of a string intercept, this is a test!";
Alert (Getstractuallen (STR1));
Alert (GETINTERCEPTEDSTR (str1,25));
</script>
</body>
|
