JavaScript对象和数组

最新推荐文章于 2025-08-07 21:48:39 发布

最新推荐文章于 2025-08-07 21:48:39 发布 · 55 阅读

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>数组与对象</title>
<script type="text/javascript">
    //创建数组
    var arr = new Array();
	arr[0] = 123;
	arr[1] = "Hello";
	arr[2] = 12.23;
	arr[3] = true;
	arr[6] = 45;
	alert(arr[0]);//输出123
	alert(arr.length);//输出4
	alert(arr[4]);//输出undefined
	alert(arr[arr.length-1]);//输出最后一个元素，true
	
	/*遍历数组*/
	for(var i=0;i<arr.length && arr[i] != undefined;i++)
	{
		alert("数组第"+i+"元素："+arr[i]);
	}
	
	//创建数组并赋值
	var b = new Array(1,2,3,4,5,6);
	
	//创建一个长度为0的数组
	var d = [];
	alert(d,length);//输出为0
	
	//创建数组
	var date = new Array();
	date[0] = 1234;
	date[1] = "H";
	date[2] = true;
	date[3] = 120.12;
	//向数组末尾添加元素
	date.push(25);
	alert(date[date.length-1]);//输出25
	date.push(1,2,3,4);
	alert(date.length);//输出9
	
	//delete删除元素，数组长度不变
	delete date[0];
	alert(date[0]);//输出undefined
	alert(date.length);//输出9
	
	alert(date.join("#"));//输出#H#true#120.12#25#1#2#3#4
	
</script>
</head>

<body>
</body>
</html>