IE和firefox上option添加、删除兼容性例子

添加：

var newOpt = document.createElement("option");

newOpt.text = newIp;

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remoteIps.options.add(newOpt);

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			function addIps(){
				
				var remote_ip = document.getElementById("remote_ip");
				var ip = remote_ip.value;
				var isValid = f_check_IP(ip);
				//alert(f_check_IP(ip));
				if(!isValid){
					//alert("请填写正确的IP地址！");
					remote_ip.select();
					return;
				}
				var remoteIps = document.getElementById("remoteIps");
				var ops = remoteIps.options;
				var len = ops==null?0:ops.length;
				var newIp = document.getElementById("remote_ip").value;
				//alert(newIp);
				var newOpt = document.createElement("option");
				//var newOption = document.createElement('<option value="' + newIp + '"></option>');
				
				//newOption.text = newIp;
				newOpt.text = newIp;
				//alert("boss"); 
				var notExit = true;
				for(var i = 0;i < ops.length;i++){
					var txt = ops[i].value;
					if(txt == newIp){
						notExit = false;
						break;
					}
				}
				if(notExit){
					//remoteIps.options.add(newOption);
					remoteIps.options.add(newOpt);
				}
				else{
					alert("该IP地址已在允许的IP列表中！");
				}
			}

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			function f_check_IP(ip)    
		    { // alert("ip");
		       //var ip = document.getElementById('host').value;
		      
		        var re=/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/;//正则表达式   
		        if(re.test(ip))   
		        {   
		            if( RegExp.$1<256 && RegExp.$2<256 && RegExp.$3<256 && RegExp.$4<256) 
		            return true;   
		        }   
		        //alert("IP有误！");   
		        return false; 
		     
		    }

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删除：

remoteIps.remove(i);

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			function removeSelected(){
				
				var remoteIps = document.getElementById("remoteIps");
				var ops = remoteIps.options;
				var len = ops==null?0:ops.length;
				//alert("ops.length = " + len);
				
				var noneSelect = true;					//假设都没选中
				if(len > 0){
					
					for(var i = 0;i < len;i++){
						//alert("i = " + i);
						var op = ops[i];
						//alert("op.selected = " + op.selected);
						if(op != null && op.selected){	//都没选中不再成立
							noneSelect = false;
							alert("op.selected = " + op.selected);
								remoteIps.remove(i);
								//remoteIps.options.remove(i);
							alert("danny");
							i -= 1;
							//len += 1;
						}
					}
				}
				if(noneSelect){
					alert("请您先选中条目再删除！");
				}
				//var ips = remoteIps.selectedIndex;
			}

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