Javascript -- Math&Date

Math.random()   //returns a random number betwen 0 and 1

Math.min() & Math.max();

Math.round(): rounds a number to the nearest integer

　　　　Math.round(4.6);   //returns 5

　　　　Math.round(4.4);   //returns 4

Math.ceil() & Math.floor();

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*4 ways of initiating a date:

　　*new Date(); new Date(milliseconds); new Date(dateString); new Date(year,month,day,hours,minutes,seconds,milliseconds);

*toUTCString(): converts a date to a UTC string

<script>
   var d = new Date();
   var dStr = d.toUTCString();
</script>

*Common methos of Date:

　　getDate():　　　  Get the day as a number (1-31)

　　getDay():　　　　Get the weekday as a number (0-6)

　　getFullYear():　　Get the four digit year (yyyy)

　　getHours():　　　Get the hour (0-23)

　　getMilliseconds():Get the milliseconds (0-999)

　　getMinutes():     Get the minutes (0-59)

　　getMonth():　　  Get the month (0-11)

　　getSeconds():    Get the seconds (0-59)

　　getTime():         Get the time (milliseconds since January 1, 1970)