面试题继发执行 : 1s后执行10，等1s后输出20，再等1s后输出30

<script type="text/javascript">
			function Pro(val) {
				return new Promise((resolve, reject) => {
					setTimeout(function() {
						resolve(val)
					}, 1000)
				})
			}

			async function log(arrs) {
				for(const item of arrs) {
					var response = await Pro(item);
					console.log(response);
				}
			}

			log([10, 20, 30])
		</script>