计算范围内字符出现次数

	countAll(21)
		
		function countAll(num){
			var countAllNum = 0;
			for (var i = 1; i <= num; i++) {
				countAllNum+=countSingle(i);
			}
			console.log(countAllNum)
			return countAllNum;
		}

		function countSingle(str) {
			str += "";
			let count = 0;
			str = str.split("");
			str.forEach((item) => {
				if (item == 1) {
					count++;
				}
			})
			return count;
		}