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Copy path24（数组的创建和特点）.html
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24（数组的创建和特点）.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
// 数组属于对象类型:很多属性（变量）和方法（函数）的集合体；
// 隐性创建数组，数组的序号(下标)从0开始
// 数组的length长度永远比下标大1
// var dianying = ["爱情剧","动作剧","犯罪剧","喜剧"];
//数组的长度length
// document.write(dianying.length);
// 如果我想查看爱情剧和喜剧
// document.write(dianying[0],"<br />",dianying[3]);
// 替换数据
// dianying[1] = "18禁片";
// document.write(dianying);
// 元素的增加
// dianying[4] = "玄幻剧";
// dianying[5] = "仙侠剧";
// document.write(dianying);
// dianying[dianying.length] = "脑残剧";
// dianying[dianying.length] = "耽美剧";
// document.write(dianying);
var dongman =["火影忍者","海贼王","龙与虎","战斗陀螺","魔法少女"]//数组创建
document.write(dongman.length,"<br />");//查看数组长度
document.write(dongman[3],"<br />"); //查看第四个数据
dongman[3] = "死神";//替换数据-把战斗陀螺替换成死神
document.write(dongman,"<br />");//替换结果
// 新增元素5和6
dongman[5] = "fate stay night";//新增5号元素，这种增加是按序号来增加
dongman[dongman.length] = "紫罗兰花园";//新增6号元素，这种是按数组长度length来增加
document.write(dongman);
</script>
</head>
<body>
</body>
</html>