html运行实例（eg_js_ifthenelse）-搜寻教程库

代码示例：（标识：eg_js_ifthenelse）

<!DOCTYPE html>
<html>
<body>

<p>单击按钮以显示基于时间的问候语：</p>

<button onclick="myFunction()">试一试</button>

<p id="demo"></p>

<script>
function myFunction() {
  var hour = new Date().getHours(); 
  var greeting;
  if (hour < 18) {
    greeting = "日安";
  } else {
    greeting = "晚安";
  }
  document.getElementById("demo").innerHTML = greeting;
}
</script>

</body>
</html>