JS根據日期得出星期幾

function getweekday(date){
var weekArray = new Array("日", "一", "二", "三", "四", "五", "六");

var week = weekArray[new Date(date).getDay()];//注意此處必須是先new一個Date

return week;

}

 

例如：

1、獲取系統時間並得出星期

var week = weekArray[new Date().getDay()];

2、根據給定例如

var da = '2017-12-12';

var week = weekArray[new Date(da).getDay()];//注意此處必須是先new一個Date