var arr1 = [1,3,5,7,9];
var arr2 = [1,2,3,4,5,6,7,8,9];
console.log(arr1);
console.log(arr2);
for (var i = 0; i < arr2.length; i++){
for (var j = 0; j < arr1.length; j++){
if (arr2[i] == arr1[j]){
arr2.splice(i,1);
}
}
}
console.log(arr2);
arr2是要去除与另一个数组中的值相同的数组, 如果把arr2和arr1互换, 前后两者结果如图: