JavaScript获得当前日期是星期几，主要通过getDay函数获得当前日期是一个星期的第几天
<!DOCTYPE html>
<html>
<body>
<p id="demo">
Click the button to display todays day of the week.
</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var d = new Date();
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";
var x = document.getElementById("demo");
x.innerHTML=weekday[d.getDay()];
}
</script>
</body>
</html>
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