JS : push() 方法
const chores = ['wash dishes', 'do laundry', 'take out trash'];chores.push('cook', 'sleep');
console.log(chores);用 push() 方法去增加 elements.
const newItemTracker = ['item 0', 'item 1', 'item 2'];
const removed = newItemTracker.pop();
console.log(newItemTracker);
// Output: [ 'item 0', 'item 1' ]
console.log(removed);
// Output: item 2用 pop() 方法去 remove 最後一個 element.
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