array

<script language="javascript">
var a = new Array(3);
a[0] = 'a';
a[1] = 'b';
a[2] = 'c';
document.write(a[1]+'<br>');

var a2 = new Array('d', 'e', 'f');
document.write(a2[1]+'<br>');

var a3 = a.concat(a2);  //合并数组
document.write(a3.length+'<br>');

var a4 = new Array();  //创建一个程度为0的空数组
document.write(a4.length+'<br>');
a4.push('aa');  //向数组中添加字符串
a4.push('bb', 'cc');  ////向数组中添加多个字符串
document.write(a4.length + '<br>');

var a5 = a4.join(':');  //转换为以:分隔的字符串
document.write(a5+'<br>');  //a5[1]是错误的，因为此时a5已经是字符串了

</script>