javascript获取本月第一天是周几时,为什么下面这个写法错误?
错误写法:
var now = new Date();
var firstDay = now.setDate(1).getDay();
提示: Uncaught TypeError: now.setDate(...).getDay is not a function
改成这样就又可以:
var now = new Date();
now.setDate(1);
var firstDay = now.getDay();