js gb2312转utf8

<script>
function utf8(wide) {
    var c, s;
    var enc = "";
    var i = 0;
    while (i < wide.length) {
        c = wide.charCodeAt(i++);
        // handle UTF-16 surrogates
        if (c >= 0xDC00 && c < 0xE000) continue;
        if (c >= 0xD800 && c < 0xDC00) {
            if (i >= wide.length) continue;
            s = wide.charCodeAt(i++);
            if (s < 0xDC00 || c >= 0xDE00) continue;
            c = ((c - 0xD800) << 10) + (s - 0xDC00) + 0x10000;
        }
        // output value
        if (c < 0x80) enc += String.fromCharCode(c);
        else if (c < 0x800) enc += String.fromCharCode(0xC0 + (c >> 6), 0x80 + (c & 0x3F));
        else if (c < 0x10000) enc += String.fromCharCode(0xE0 + (c >> 12), 0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
        else enc += String.fromCharCode(0xF0 + (c >> 18), 0x80 + (c >> 12 & 0x3F), 0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
    }
    return enc;
}
var hexchars = "0123456789ABCDEF";

function toHex(n) {
    return hexchars.charAt(n >> 4) + hexchars.charAt(n & 0xF);
}
var okURIchars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-";

function toUTFChar(s) {
    var s = utf8(s);
    var c;
    var enc = "";
    for (var i = 0; i < s.length; i++) {
        if (okURIchars.indexOf(s.charAt(i)) == -1)
            enc += "%" + toHex(s.charCodeAt(i));
        else
            enc += s.charAt(i);
    }
    return enc;
}
//案例测试
alert(toUTFChar("汉字")) //gb2312转utf-8
alert(decodeURIComponent(toUTFChar("汉字"))) //解utf-8到gb2312

 
</script>

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