javascript scheduled advertising display (two time periods) [original]_advertising code

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showit requires three parameters
showit(str,start,end);
str is generally an advertising code such as "Script Home"
start is the start date, which generally must be in the format of "2009-08-02"
end is the advertising expiration time, which must be in the format of "2009-08-02"This is very important. Otherwise it will not be displayed, please fill it in as needed.