将基于10进制的字符串unicode编码转换为基于16进制的unicode字符串编码

U2A.js

// U2A('博时货');
// return '\u234A\u3BaD\u42EA\u1BC3'

var U2A = function(s){

    var r = s.replace(/&#(\d+);/ig,'\\u{$1}');
    var A = r.match(/\d+/ig);

    for(var i = 0;i<A.length;i++){
        r = r.replace('\\u{'+A[i].toString()+'}',String.fromCharCode(A[i]));
    }   

    return r;
};