Chapter JavaScript objects operating BOM

Chapter II: JavaScript operating BOM
 window object's properties:
  history:
   Method:
    the Back () before loading a URL history list of objects in the
    forward () to load the next URL history list of objects
    go () to load a history list of objects a specific URL
  LOCATION:
   property:
    host sets or returns the host name and the URL of the current port number
    hostname Sets or returns the current URL's hostname
    href Sets or returns the full URL
   method:
    reload () reload the current document
    replace () with a new document replace the current document
  document:
   attribute:
    referrer URL returns the load current document
    URL to return the current document URL
   
   method:
    getElementById returns a reference () for the first object has a specified id of
    getElementsByName () returns the object with the specified name collection
    the getElementsByTagName () returns a collection object with the specified name in the tag
 window object:
  prompt () displays the dialog can prompt the user to enter the
  alert () is displayed with a warning message and an OK button box
  confirm () with a display message, and a cancel button confirmation dialog
  close () Closes browser window
  open () opens a new browser window to load the given URL specified in the document
  setTimeout () function call after a specified number of milliseconds or calculation expression
  setInterval () in the specified period (in milliseconds) to call the function or expression 
 Date:
  getDate () every day between the value of the Date object month ~ 31 is between. 1
  getDay () Date object of each day of the week, which is a value between 0 and 6
  getHours () Date object hours, the value 23 is between ~ 0
  getMinutes () returns the number of minutes Date object, the value is between 59 ~ 0
  the getSeconds () returns the seconds Date object whose value is between 59 ~ 0
  the getMonth () returns the month Date object, the value is between. 11 ~ 0
  the getFullYear () Date object year, a value of 4 digits
  getTime () returns from a time (1970 on January 1) to The number of milliseconds
 the Math:
  ceil () logarithm rounded Math.ceil (25.5); return 26
  Math.ceil (-25.5); returns -25
  Floor () the logarithm rounded Math.floor (25.5); return 25
  Math.floor (-25.5); returns -26
  round () the number rounded to the nearest number Math.round (25.5); return 26 is
  Math.round (-25.5); returns -26
  random () returns a random number Math.random (between 0 and 1); for example: 0.6273608814137365
  
  
 timers:
  the setTimeout:
   number // ms after the triggering
   the setTimeout (function () {
    / * Alert ( 'Hongtao'); * /
   }, 3000);
  the setInterval:
  // ms representing each trigger
   var interval the = the setInterval (function () {
    // create a Date object
    var datetime a Date new new = ();
    //01.getElementById () Gets the element with an id attribute value
    var span = document.getElementById ( 'span01');
    span.innerHTML = datetime;
    
   }, 1000);
  
  
  Case:
   <Script type = "text / JavaScript">
    var Time = 10;
    var interval The;
    triggered // Start button click
    function Start () {
     // each -1 second
     interval The = the setInterval (function () {
      TIME - ;
      // assignment to span
      document.getElementById ( 'Time') the innerHTML = Time;.
      IF (Time <= 0) {
       // stop the timer
       the clearInterval (interval The);
      }
     }, 1000);
    };
    
    function sTOP () {
     the clearInterval (interval The);
    };

   </script>