运用jdk

				
					function add()
					{
						var index = document.all.select1.selectedIndex;
						if(index!=-1)
						{
							var value = document.all.select1.options[index].value;
							var item = document.all.select1.options[index].text;
							
							//检查是否有重复的
							var bool = 0;
							for(var i=0;i							{
								if(document.all.select2.options[i].value==value)
								{
									bool = 1;
									break;
								}
							}
				
							//添加
							if(bool==0)
							{
								var oOption = document.createElement("OPTION");
								document.all.select2.options.add(oOption);
								oOption.innerText = item;
								oOption.value = value;
							}
						}
					}
				
					function del()
					{
						var index = document.all.select2.selectedIndex;
						if(index==-1)return;
						document.all.select2.options.remove(index);
					}
					
					function addall()
					{
						//清空已选列表
						var length = document.all.select2.length;
						for(var i=0;i						{
							document.all.select2.options.remove(0);
						}
						
						//添加全部列表
						for(var i=0;i						{
							var item = document.all.select1.options[i].text;
							var value = document.all.select1.options[i].value;
							var oOption = document.createElement("OPTION");
							document.all.select2.options.add(oOption);
							oOption.innerText = item;
							oOption.value = value;
						}
					}
				
					function delall()
					{
						var length = document.all.select2.length;
						for(var i=0;i						{
							document.all.select2.options.remove(0);
						}
					}