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<!DOCTYPE html>
<html>
<body>
<p>如果时间早于20:00,会获得问候“Good day”</p>
<button type="button" onclick="myFunction()">点击此处 </button>
<p id="demo"> </p>
</body>
</html>
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function myFunction(){
var a="";
var time=new Date().getHours();
if (time<=20){
a="Good day";
}
else{
a="Good evening";
document.getElementById("demo").innerHTML=a;
<head>
<meta charset="utf-8">
<title>ABC</title>
</head>