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Real-time feedback of system time using pure JavaScript

小云云Original: 2017-12-09 14:18:011615browse

JavaScript is a very useful language. In this article, we mainly introduce the relevant information on realizing real-time feedback system time in pure JavaScript. Friends who need it can refer to it. I hope it can help everyone.

Feedback system time using javascript

Use knowledge

JavaScript HTML DOM

The setInterval() method in HTML DOM will continuously call the function until clearInterval() is called or the window is closed. The ID value returned by setInterval() can be used as an argument to the clearInterval() method.

SyntaxsetInterval(code,milliseconds)

code——code (can be a function)

milliseconds——the time of this call (milliseconds) )

Therefore, we want the feedback system time to move. We only need to make the method call every 1000 milliseconds to make the displayed time move like an alarm clock.

setInterval(function(){myTimer()},1000)

new Date()//获得当前时间
.toLocaleTimeString()//根据本地时间把Date对象的时间部分转换为字符串
.getElementById("clock")//返回带有指定 ID 的元素
.innerHTML=c; //将c返回给指定元素

Code part

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <p id="clock"></p>
</body>
<script>
  var a = setInterval(function(){myTimer()},1000);
  function myTimer(){
    var b = new Date();
    var c = b.toLocaleTimeString();
    document.getElementById("clock").innerHTML=c;
  }
</script>
</html>

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