转换Unicode (JS)

Encrypt = function() {
	var F = {};
	F.toUnicode = function(s) {
		var res = [];
		var len = s.length - 1;
		while (len > -1) {
			var ch = s.charCodeAt(len--);
			if (!isNaN(ch)) {
				res.push(ch);
			}
		}
		res.push('');
		return res.reverse().join('&#');
	};
	F.toUnicode2 = function(s) {
		var res = [];
		var len = s.length - 1;
		while (len > -1) {
			var ch = s.charCodeAt(len--);
			if (!isNaN(ch)) {
				chch = ch.toString(16);
				switch (ch.length) {
					case 4 : {
						chch = ch;
					}
						break;
					case 3 : {
						ch = '0' + ch;
					}
						break;
					case 2 : {
						ch = '00' + ch;
					}
						break;
					case 1 : {
						ch = '000' + ch;
					}
						break;
					default :
						ch = null;
				}
				if (ch != null) {
					res.push(ch);
				}
			}
		}
		res.push('');
		return res.reverse().join('\\u');
	};
	F.toGBK = function(s) {
		var res = [''];
		if (s.indexOf('&#') === 0) {
			for (var i = 1, cs = s.split('&#'), len = cs.length; i < len; i++) {
				res.push(String.fromCharCode(cs[i]));
			}
			return res.join('');
		} else if (s.indexOf('\\u') === 0) {
			for (var i = 1, cs = s.split('\\u'), len = cs.length; i < len; i++) {
				res.push(String.fromCharCode(parseInt(cs[i], 16)));
			}
			return res.join('');
		}
		return '';
	};
	return F;
}();

function toUnicode() {
	window.document.getElementById('result').value = Encrypt.toUnicode(window.document.getElementById('param').value + '')
}
function toUnicode2() {
	window.document.getElementById('result').value = Encrypt.toUnicode2(window.document.getElementById('param').value + '')
}
function toGBK() {
	window.document.getElementById('result').value = Encrypt.toGBK(window.document.getElementById('param').value + '');
}

Encrypt = function() {
	var F = {};
	F.toUnicode = function(s) {
		var res = [];
		var len = s.length - 1;
		while (len > -1) {
			var ch = s.charCodeAt(len--);
			if (!isNaN(ch)) {
				res.push(ch);
			}
		}
		res.push('');
		return res.reverse().join('&#');
	};
	F.toUnicode2 = function(s) {
		var res = [];
		var len = s.length - 1;
		while (len > -1) {
			var ch = s.charCodeAt(len--);
			if (!isNaN(ch)) {
				chch = ch.toString(16);
				switch (ch.length) {
					case 4 : {
						chch = ch;
					}
						break;
					case 3 : {
						ch = '0' + ch;
					}
						break;
					case 2 : {
						ch = '00' + ch;
					}
						break;
					case 1 : {
						ch = '000' + ch;
					}
						break;
					default :
						ch = null;
				}
				if (ch != null) {
					res.push(ch);
				}
			}
		}
		res.push('');
		return res.reverse().join('\\u');
	};
	F.toGBK = function(s) {
		var res = [''];
		if (s.indexOf('&#') === 0) {
			for (var i = 1, cs = s.split('&#'), len = cs.length; i < len; i++) {
				res.push(String.fromCharCode(cs[i]));
			}
			return res.join('');
		} else if (s.indexOf('\\u') === 0) {
			for (var i = 1, cs = s.split('\\u'), len = cs.length; i < len; i++) {
				res.push(String.fromCharCode(parseInt(cs[i], 16)));
			}
			return res.join('');
		}
		return '';
	};
	return F;
}();

function toUnicode() {
	window.document.getElementById('result').value = Encrypt.toUnicode(window.document.getElementById('param').value + '')
}
function toUnicode2() {
	window.document.getElementById('result').value = Encrypt.toUnicode2(window.document.getElementById('param').value + '')
}
function toGBK() {
	window.document.getElementById('result').value = Encrypt.toGBK(window.document.getElementById('param').value + '');
}