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// 繼承 JavaScript 內置的 Date 對象
class LinDate extends Date {
getFormattedDate() {
var months = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
return this.getDate() + "-" + months[this.getMonth()] + "-" + this.getFullYear();
}
}
const date = new LinDate()
console.log(date.getFullYear()); // 2020
console.log(date.getFormattedDate()) // 7-Jan-2020
運行結果