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【数组】-JavaScript
迷途何必知返
Original
796 people have browsed it
<!DOCTYPE html>
<html>
<head>
<title>数组</title>
</head>
<body>
<!-- 数组:方便存取和减少内存的占用 
     作用:使用单独的变量名来存储一系列的值 -->
    <!-- 下标(房间号)从零开始 数组的总数就是最后一个下标加一 -->
<!-- <script type="text/javascript">
     //创建数组 通过操作符和构造函数来创造数组
     //三种方法实例
     var a=new Array()
         a[0]='PHP';
         a[1]='HTML';
         a[2]='WEB';
     var a=Array('PHP','HTML','WEB');
     var a=['PHP','HTML','WEB']
    // 访问数组 通过指定的数组名,以及对应的下标(索引号码)来访问数组。
    document.write(a[1])
</script> -->

    <!-- 以下是二维数组的创建方法 -->
<!-- <script type="text/javascript">
     var b=new Array('PHP','HTML','WEB');
     b[0]=new Array(1,2,3,4);
     b[1]=new Array('张三','李四','王二');
</script> -->

<!-- 学习章节小练习案例 :创建一份二维数组,然后改变他对应的值-->
<!-- <script type="text/javascript">
   var box=new Array(
       new Array(11,12),
       new Array(13,14),

   )
       document.write(box[1][1])
       document.write('<br>')
       //改变数组内部的值 赋值100改变
       box[1][1]=100;
       document.write(box[1][1])
</script> -->

<!-- for in 循环 : 循环输出数组中所有的元素-->
<script type="text/javascript">
      var week=new Array()
      week[0]='PHP'
      week[1]='PHP1'
      week[2]='PHP2'
    for (x in week){
      document.write(week[x]+'<br>')
    }
</script>
</body>
</html>


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