计算utf8下的字节数

最新推荐文章于 2024-04-08 18:22:08 发布

Tunix126

最新推荐文章于 2024-04-08 18:22:08 发布

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分类专栏： Java/Jsp/JS 算法、数据结构文章标签： function html button c div input

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> An utf8 count tool  </TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=utf16">
<script>
    function utf16to8(str) {
        var out, i, len, c;

        out = "";
        len = str.length;
        for(i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if ((c >= 0x0001) && (c <= 0x007F)) {
            out += str.charAt(i);
        } else if (c > 0x07FF) {
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
            out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
        } else {
            out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
        }
        }
        return out;
    }
    function count()
    {
        var temp = f1.value;
        temp=temp.replace(///r/g,"/r");
        temp=temp.replace(///n/g,"/n");
        result.innerHTML=utf16to8(temp).length;
    }
</script>
</HEAD>

<BODY>
<TEXTAREA id="f1" NAME="f1" ROWS="10" COLS="50"></TEXTAREA>
<br/>
<INPUT TYPE="button" value="count length" onclick="count()">
<div id="result"></div>
</BODY>
</HTML>