js not expired by the time stamp judgment (judgment similar downward applets)

. 1  var currentTime = Date.parse ( new new a Date ()); // current timestamp 
2  var SetTimeStr = localStorage.getItem ( 'SetTimeStr') *. 1 ;
 . 3  var NewTime = new new . A Date () the getTime () + 3600000 * 12 is ; // new expiration time 
. 4  IF (currentTime < SetTimeStr) {
 . 5      the console.log ( "cache valid time _" );
 . 6      localStorage.setItem ( 'SetTimeStr' , NewTime)
 . 7 } the else { . 8      localStorage.setItem ( 'SetTimeStr ' , NewTime)
 . 9 }

 

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