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<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>
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<body>
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