练习1,练习2

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#1 Created at ... [Delete] [Delete and Lock User]

练习1

'use strict';
var arr = [[1, 2, 3], [400, 500, 600], '-'];
arr[1].splice(0,1);
var x=arr[1].pop();
alert(x);

练习2

'use strict';
var arr = ['小明', '小红', '大军', '阿黄'];
var len=arr.length;
alert('欢迎'+arr.splice(0,len-1)+'和'+arr.pop()+'同学!');

#2 Created at ... [Delete] [Delete and Lock User]

你写得比我聪明多了，顶一个！附一个我写的ㄒoㄒ：练习一、

var arr = [[1, 2, 3], [400, 500, 600], '-'];
var arrA=arr[1];
var x=arrA[1];

练二

var arr = ['小明', '小红', '大军', '阿黄'];
arr.sort();
var len=arr.length;
alert("欢迎"+arr[0]+","+arr[1]+","+arr[2]+",和"+arr[3]+"同学！")

#3 Created at ... [Delete] [Delete and Lock User]

        var arr5 = ['小明', '小红', '大军', '阿黄'];
        var arr6 = arr5.pop();
        alert('欢迎'+arr5.join(',')+'和'+arr6+'同学');

我是這样写的。。