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var ut = Math.floor((new Date()).getTime()/1000);
var week = Math.floor(ut / 60 / 60 / 24 / 7);
var year = Math.floor(ut / 60 / 60 / 24 / 365);

console.log(week);

if(week % 2 == 1) {
  console.log('奇数週');
} else {
  console.log('偶数週')
}