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js 年月之間差值 集合

<!-- 取 年月之間差值 集合-->
		<script>
			var firstYear = '201609';
			var lastYear  = '201910';
			
			//共幾年
			var chaYear =  parseInt(lastYear.slice(0,4)) - parseInt(firstYear.slice(0,4)) +1 ;
			//有哪些年
			var yearArr = [];
			//年月列表
			var yearMonthArr = [];
			
			var firstMonth = parseInt(firstYear.slice(4,6));
			
			var lastYear = parseInt(lastYear.slice(4,6));
			
			for( var i=0; i<chaYear; i++ ){
				yearArr.push(parseInt(firstYear.slice(0,4))+i);
			}
			
			//第一年
			for( var i=firstMonth; i<=12; i++ ){
				var mon = firstMonth++;
				yearMonthArr.push( yearArr[0]+''+(mon<10?0+''+mon:mon));
			}
			//中年年
			for( var i=1; i<=yearArr.length-2; i++ ){
				var  nowYear = parseInt(yearArr[0])+1;
				for( var j=1; j<=12; j++ ) {
					yearMonthArr.push(nowYear+''+(j<10?0+''+j:j));
				}
			}
			//當前年
			for( var i=1; i<=lastYear; i++ ){
				yearMonthArr.push( yearArr[yearArr.length-1]+''+(i<10?0+''+i:i));
			}
			
			console.log(yearMonthArr);
			
		</script>