jsランダム出力7桁コード教程を書く

	var arr= [01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]
	 arr2=[];
	//     
	 function cp2(arr,arr2){
	 	for(j=0;j<7;j++){
	 		var b= Math.floor(Math.random()*arr.length);
 		arr2.push(arr[b])
			arr.splice(b,1);
		}
	document.write(arr2,",");
	 }
	 cp2(arr,arr2);

	//     
	function cp(arr){
		for(j=0;j<7;j++){
			var b= Math.floor(Math.random()*arr.length);
			var re=arr.splice(b,1);
			document.write(re,",");
			
		}
	}
	cp(arr);