存放技術之地

The splice() method changes the contents of an array by removing or replacing existing elements and/or adding new elements in place. To access part of an array without modifying it, see slice() 可以把 array 裡的元素取代、移除或是新增元素。 const months = ['Jan', 'March', 'April', 'June']; months.splice(1, 0, 'Feb'); // inserts at index 1 console.log(months); // expected output: Array ["Jan", "Feb", "March", "April", "June"] months.splice(4, 1, 'May'); // replaces 1 element at index 4 console.log(months); // expected output: Array ["Jan", "Feb", "March", "April", "May"] splice(start) splice(start, deleteCount) splice(start, deleteCount, item1) splice(start, deleteCount, item1, item2, itemN) 來源： https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice