Javascript utf-8中文字符转二进制，utf-8中文code转中文字

	var s="中";
	var code = s.charCodeAt(0);
	var b1 = (7<<5)+((code>>12)&0xf);
	var b2 = ((code>>6) & 0x3f);
	var b3 = code & 0x3f;
	
	var bytedata = [String.fromCharCode(b1),String.fromCharCode(b2),String.fromCharCode(b3)];

	newchar = ((b1 & 0xf) << 12 | (b2 & 0x3f) << 6 | (b3 & 0x3f));
	console.log(String.fromCharCode(newchar))