<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>数组</title>
<script type="text/javascript">
// var score1 = 100;
// var score2 = 30;
// var score3 = 20;
//数组可以存储一组数据
var arr1 = new Array();
arr1[0] = 100;
arr1[1] = 30;
arr1[2] = 60;
arr1[3] = "sikiedu.com";// arr1[3] = 70;
arr1[4] = 80;
arr1[5] = 90;
console.log(arr1[3]);//70 //注释掉arr1[3] = 70; 打印结果是undefined //字符串arr1[3]="sikiedu.com";居然也能打印出来。
console.log(arr1.length);//6 //注释掉arr1[3] = 70; 打印结果仍然是6
for(var i=0;i<arr1.length;i++){
console.log(arr1[i]);
}
</script>
</head>
<body>
</body>
</html>
数组
1、创建数组
var myArray=new Array()
var mycars=new Array(3) 数组的长度是不固定的
var mycars=new Array("Saab","Volvo","BMW")
2、访问数组元素和设置数组元素
mycars[0]
mycars[0]="Opel"
3、取得数组长度
arr.length
