通过web页面选择select的option设置网页刷新时间间隔（此时为写入cookie），javascr ipt读取select的option的存入cookie值，使得页面刷新也能保持select当前选项

比如说有三个选项A B C分别对应的值是1 2 3 选择 B之后即使页面刷新也会保持B不变!-Through a web page select the Select the option to set the page refresh interval (in this case, write the cookie), javascr ipt select the option to read the stored cookie value, making the page refresh can keep select this option example, there are three options correspond ABC The value is 123 Option B even after page refresh will remain unchanged B!