jQuery Tutorial: Selecting Multiple Select Form Elements on the Fly
Select None
Select all Red
Select all Green
Select all Blue
Select all Colors
Red & Green
Colors:
Red - Option 1
Red - Option 2
Red - Option 3
Green - Option 1
Green - Option 2
Green - Option 3
Blue - Option 1
Blue - Option 2
Blue - Option 3
适用浏览器：IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗.
来源：
Gxl网-jquery插件