js数组合并的两种方法
// 第一种var mergeTo = [4,5,6], mergeFrom = [7,8,9];mergeTo = mergeTo.concat(mergeFrom);mergeTo; // is: [4, 5, 6, 7, 8, 9]orvar a = [1,2], b = [3,4], c = a.concat(b);// 第二种var mergeTo = [4,5,6],var mergeFrom = [7,8,9];Array.prototype.push.apply(mergeTo, mergeFrom);mergeTo; // is: [4, 5, 6, 7, 8, 9]

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