js操作select，增，删，改，查

1.清空select的项 

1 objSelect.options.length = 0; 

2.如果留下第一行的话就是

1 objSelect.options.length = 1;  

3.添加option

1 objSelect.options.add(new Option(text, value))

4.删除一个option

1 objSelect.options.remove(i);

5.修改option内容

1 objSelect.options[i].value = value2 objSelect.options[i].text = text

6.设置一个option为默认选择状态

1 objSelect.options[i].selected = true;

7.当前select选中项的value

1 objSelect.value

8.当前select选中项的Index

1 objSelect.selectedIndex

例子:

    var wareSelect=$('wareSelect');
    if(wareSelect != null){
      //先清空select值
      wareSelect.options.length = 0;
      //设置默认选项
      wareSelect.options.add(new Option("请选择",""));
      for(var i=0;i<wares.length;i++) {        wareSelect.options.add(new Option(wares[i].name,wares[i].id));
        if(wares[i].id==config.wareid){
           wareSelect.options[i+1].selected = true;
        }      }        }