js把編碼轉換成 gb2312編碼

//把編碼轉換成 gb2312編碼 
				function UrlEncode(str) 
				{ 
					var i, c, ret="", strSpecial="!\"#$%&'()*+,/:;<=>?@[\]^`{|}~%"; 
					for(i = 0; i < str.length; i++) 
					{ 
					//alert(str.charCodeAt(i));
					
					c = str.charAt(i); 
					if(c==" ") 
					ret+="+"; 
					else if(strSpecial.indexOf(c)!=-1) 
					ret += "%" + str.charCodeAt(i).toString(16); 
					if(z[str.charCodeAt(i)]　!= null) 
					{ 
					d = z[str.charCodeAt(i)]; 
					try 
					{ 
					ret += "%" + d.slice(0,2) + "%" + d.slice(-2); 
					} 
					catch (e) 
					{ 
					alert(" $$ error name = " + e.name + ", message = " +e.message + ", d " + i + "= " + str.charCodeAt(i)) 
					} 
					} 
					else 
					ret += c; 
					} 
					return ret; 
					}

					function getSpell(str, sp) 
					{ 
					var i, c, t, ret=""; 
					if(sp == null) 
					sp="";

					for(i = 0; i < str.length; i++) 
					{ 
					if(str.charCodeAt(i) >= 0x4e00) 
					{ 
					c = parseInt(z[str.charCodeAt(i)], 16); 
					if(c < 55290) 
					{ 
					for(t = qswhSpell.length-1; t > 0; t = t - 2) 
					if(qswhSpell[t] <= c) 
					break; 
					if(t > 0) 
					ret += qswhSpell[t - 1] + sp; 
					} 
					} 
					} a
					return ret.substr(0, ret.length-sp.length); 
				}