小编ash*_*edi的帖子

var x = [1, 2, 3, 4, 5, 6];

function change1(y) {
  y[0] = 7;
  y[1] = 8;
  y[2] = 9;
  y[3] = 10;
  y[4] = 11;
  y[5] = 12;
}
change1(x);
console.log(x);

var z = [1, 2, 3, 4, 5, 6];

function change2(y) {
  y = [7, 8, 9, 10, 11, 12];
}
change2(z);
console.log(z);