​x
 
<!DOCTYPE html>
<html>
<body>
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<p>单击该按钮可显示今天是星期几。</p>
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<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<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 n = weekday[d.getDay()];
  document.getElementById("demo").innerHTML = n;
}
</script>
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</body>
</html>
​