function intersection(){ var A = [1,4,3,3], B = [1,4,5,7], C =[]; A = A.concat(B); for(i = 0; i < A.length; i++){ if(C.indexOf(A[i]) == -1){ C.push(A[i]); } } C.sort(); console.log(C.toString().replace(/,/g, " ")); } //第二题 funct...