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充分利用本节知识

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扭倒费

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

q1:

var arr = [[1, 2, 3], [400, 500, 600], '-'];
var x = arr[1].slice(1,2);
alert(x);

//500

q2:

var arr = ['小明', '小红', '大军', '阿黄'];
arr.sort();
arr.splice(3,0,'和');
arr[0]=arn[0]+'，';
arr[1]=arn[1]+'，';
arr.unshift('欢迎');
arr.push('同学');
arr = arr.join('');
alert(arr);

//欢迎大军，小明，小红和阿黄同学

八尺大汉

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

Q1真的没那么复杂既然是多维数组,根据下标就直接可以取了,直接 var x = arr[1][1]; alert(x); 就是500

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