//第一种varmergeTo=[4,5,6],mergeFrom=[7,8,9];mergeTo=mergeTo.concat(mergeFrom);mergeTo;//is:[4,5,6,7,8,9]orvara=[1,2],b=[3,4],c=a.concat(b);//第二种varmergeTo=[4,5,6],varmergeFrom=[7,8,9];Array.prototype.push.apply(mergeTo,mergeFrom);mergeTo;//is:[4,5,6,7,8,9]