ex1.6 

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
	</head>
	<body>
		<script>
			
			var firstNumber = "I am a String"
			var secondNumber = 300
			var thirdNumber = firstNumber+secondNumber
			document.write(thirdNumber)
			document.write("firstNumber类型为：  "+typeof(firstNumber))
			document.write("secondNumber类型为：  "+typeof(secondNumber))
			document.write("thirdNumber类型为：  "+typeof(thirdNumber))
//			换行符???
			alert(thirdNumber)
			alert("firstNumber类型为：  "+typeof(firstNumber))
			alert("secondNumber类型为：  "+typeof(secondNumber))
			alert("thirdNumber类型为：  "+typeof(thirdNumber))
			
		</script>
	</body>
</html>

　　

posted @ 2018-09-21 10:46  是九离呀  阅读(58)  评论(0)    收藏  举报