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JS string length function Detailed introduction

Source: Internet
Author: User
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We just use

The code is as follows Copy Code

var str = "465464656464566";
var strlength = str.length;

Example 1

The code is as follows Copy Code

<script type= "Text/javascript" >
var vtext= "I like Www.111cn.net"
document.write ("<p>" + Vtext + "</p>")
document.write (Vtext.length)
</script>

<p>javascript example code explains: First declare a variable vtext, assign "I like Www.111cn.net" to Vtext, and then use

Document.Write it out, and then use the Length property to compute the vtext and display it, Vtext contains 16 words.

Character, the space is also counted, the final result is 16. If you write in Chinese, you will get the length of the medium character. Like you wrote, "I like cloth.

"I'll get the length of this string, it's 8."
</p>

Example 2

The code is as follows Copy Code

<body>

<script type= "Text/javascript" >

var txt= "Hello world!"
document.write (Txt.length)

</script>

</body>

Lose 12

Using the above experience we write a string intercept function

The code is as follows Copy Code

<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>

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Related Keywords:
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