向着自己的目标!努力!努力!再努力!
var arr= [4,5,6]; var arr1 = [7,8,9]; var arr2=[1,2,3]; arr.concat(arr1,arr2);
//或者使用Arry.prototype.push.aplly(mergeTo,mergeFrom);
arr; [4,5,6,7,8,9,1,2,3];