js 转码

<script type="text/javascript">  

var easyUTF8 = function(gbk){  

    if(!gbk){return '';}  

    var utf8 = [];  

    for(var i=0;i<gbk.length;i++){  

        var s_str = gbk.charAt(i);  

        if(!(/^%u/i.test(escape(s_str)))){utf8.push(s_str);continue;}  

        var s_char = gbk.charCodeAt(i);  

        var b_char = s_char.toString(2).split('');  

        var c_char = (b_char.length==15)?[0].concat(b_char):b_char;  

        var a_b =[];  

        a_b[0] = '1110'+c_char.splice(0,4).join('');  

        a_b[1] = '10'+c_char.splice(0,6).join('');  

        a_b[2] = '10'+c_char.splice(0,6).join('');  

        for(var n=0;n<a_b.length;n++){  

            utf8.push('%'+parseInt(a_b[n],2).toString(16).toUpperCase());  

        }  

    }  

    return utf8.join('');  

};  

document.write(easyUTF8('我爱北京！'));  

</script>