[字串轉換為unicode編碼] Convert a String to Unicode

gistfile1.js

console.log('好'.charCodeAt());    //22909
console.log('好'.charCodeAt().toString(16));    //597d
console.log(String.fromCharCode(22909));    //好
console.log(String.fromCharCode(0x597d));    //好
console.log('\u597d'); //好
console.log('\u{597d}'); //好

//prototype 擴充類別定義
//方法1 (Regex)
String.prototype.toUnicode = function() {
    return this.replace(/./g, function(char) {
        var v = char.charCodeAt(0).toString(16);
        var pad = "0000";
        return (pad.substring(0, pad.length - v.length) + v).toUpperCase();
    });
};
console.log('狂'.toUnicode());    //72C2

//方法2 (while)
String.prototype.toUnicode = function () {
    return this.replace(/./g, function (char) {
        var v = String.charCodeAt(char).toString(16);
        if (v.length != 4) {
            do {
                v = '0' + v;
            } while (v.length < 4)
        }
        return v;
    });
};
console.log('狂'.toUnicode());    //72C2