<script type="text/javascript">

    var a = new Array();

    a = "a";

    a = "b";

    a = "c";

    a = "d";

//    alert(a[0])

    for(var i=0; i<a.length; i++){

        console.log(i + " " + a[i]);

    }

</script>

<?php

    $Cities[] = "<B>北京</B>";    //等同于$Cities[0] = "北京"

    $Cities[] = "<B>天津</B>";    //等同于$Cities[1] = "天津"

    $Cities[] = "<B>上海</B>";    //等同于$Cities[2] = "上海"

    $Cities[] = "<B>深圳</B>";    //等同于$Cities[3] = "深圳"

    /*

    ** 统计元素个数

    */

    $indexLimit = count($Cities);    //把数组中元素的个数赋给$indexLimit

    /*

    ** 打印所有数组

    */

    for($index=0; $index < $indexLimit; $index++)

    {

        print("第 $index 个城市是 $Cities[$index]。 <BR>\n");

    }

?>