Trying the following code from the MDN site
var myFish = ['angel', 'clown', 'mandarin', 'surgeon'];
// removes 0 elements from index 2, and inserts 'drum'
var removed = myFish.splice(2, 0, 'drum');
Doesn't assign to remove the expected output of splice ['angel', 'clown', 'drum', 'mandarin', 'surgeon']
, but instead and empty array []
.
I think you are confused by the return value of splice
. It does not return the modified array, but the elements removed. In this case, you removed none, so if you log removed
, you get an empty Array
.
var myFish = ['angel', 'clown', 'mandarin', 'surgeon'];
var removed = myFish.splice(2, 0, 'drum');
console.log(myFish);
console.log(removed);
Output:
Array [ "angel", "clown", "drum", "mandarin", "surgeon" ]
Array [ ]
Array.prototype.splice在原始数组上运行。
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