FlashSoft {Code 1+1}

这是重发以前的老博文

function UnicodeToUTF8(strInUni) {
	if (null == strInUni) returnnull;
	var strUni = String(strInUni);
	var strUTF8 = String();
	for (var i = 0; i < strUni.length; i++) {
		var wchr = strUni.charCodeAt(i);
		if (wchr < 0x80) {
			strUTF8 += strUni.charAt(i);
		}
		else if (wchr < 0x800) {
			var chr1 = wchr & 0xff;
			var chr2 = (wchr >> 8) & 0xff;
			strUTF8 += String.fromCharCode(0xC0 | (chr2 << 2) | ((chr1 >> 6) & 0x3));
			strUTF8 += String.fromCharCode(0x80 | (chr1 & 0x3F));
		}
		else {
			var chr1 = wchr & 0xff;
			var chr2 = (wchr >> 8) & 0xff;
			strUTF8 += String.fromCharCode(0xE0 | (chr2 >> 4));
			strUTF8 += String.fromCharCode(0x80 | ((chr2 << 2) & 0x3C) | ((chr1 >> 6) & 0x3));
			strUTF8 += String.fromCharCode(0x80 | (chr1 & 0x3F));
		}
	}
	return strUTF8;
}

function UTF8ToUnicode(strInUTF8) {
	if (null == strInUTF8) return null;
	var strUTF8 = String(strInUTF8);
	var strUni = String();
	for (var i = 0; i < strUTF8.length;) {
		var chr1 = strUTF8.charCodeAt(i);
		var chr2 = strUTF8.charCodeAt(i + 1);
		var chr3 = strUTF8.charCodeAt(i + 2);
		if (chr1 < 0x80) {
			strUni += strUTF8.charAt(i);
			i++;
		}
		else if (0xC0 == (chr1 & 0xE0)) {
			if (0x80 != (chr2 & 0xC0)) return null;
			strUni += String.fromCharCode(((chr1 & 0x1F) << 6) | (chr2 & 0x3F));
			i += 2;
		}
		else if (0xE0 == (chr1 & 0xF0)) {
			if (0x80 != (chr2 & 0xC0) || 0x80 != (chr3 & 0xC0)) return null;
			strUni += String.fromCharCode(((chr1 & 0x0F) << 12) | ((chr2 & 0x3F) << 6) | (chr3 & 0x3F));
			i += 3;
		}
		else {
			return null;
		}
	}
	return strUni;
}