JS实现unicode和UTF-8互转

有一设备，为短信网关。需将PC送过来的UTF-8转换成UNICODE才能将内容通过短信发送出去，同样，接收到的短信为unicode编码，也许转换成UTF-8才能在PC端软件显示出来。程序很简单，只是走了不少弯路:

//unicode为1个接收数据，串口收到的字符编码放在该数组中
function UnicodeToUtf8(unicode) {
	var uchar;
	var utf8str = "";
	var i;
	
	for(i=0; i>8)&0xff;
			temp[j++] = uCode&0xff;
		}else if(uCode<0x1000000){
			temp[j++] = (uCode>>16)&0xff;
			temp[j++] = (uCode>>8)&0xff;
			temp[j++] = uCode&0xff;
		}else if(uCode<0x100000000){
			temp[j++] = (uCode>>24)&0xff;
			temp[j++] = (uCode>>16)&0xff;
			temp[j++] = (uCode>>8)&0xff;
			temp[j++] = uCode&0xff;
		}else{
			break;
		}
	}
	temp.length = j;
	return temp;
}