Design a simple stopwatch timer with javascript_javascript skills-JS Tutorial-php.cn

Design a simple stopwatch timer with javascript_javascript skills

WBOY

Release： 2016-05-16 15:31:14

Original

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The example in this article describes the implementation code of a simple stopwatch timer designed in JavaScript. Share it with everyone for your reference. The details are as follows:
The screenshot of the running effect is as follows:

The specific code is as follows:

<html> 
<head> 
<title> New Document </title> 
</head> 
<body> 
 <form action="somepage.asp"> 
  <input type="text" value="0" name="txt1"/> 
  <input type="button" value="开始" name="btnStart"/> 
  <input type="button" value="重置" name="btnReset"/> 
 </form> 
</body> 
</html> 
<script language="JavaScript" type="text/javascript"> 
<!-- 
//获取表单中的表单域 
var txt=document.forms[0].elements["txt1"]; 
var btnStart=document.forms[0].elements["btnStart"]; 
var btnReset=document.forms[0].elements["btnReset"] 
//定义定时器的id 
var id; 
//每10毫秒该值增加1 
var seed=0; 
btnStart.onclick=function(){ 
  //根据按钮文本来判断当前操作 
  if(this.value=="开始"){ 
    //使按钮文本变为停止 
    this.value="停止"; 
    //使重置按钮不可用 
    btnReset.disabled=true; 
    //设置定时器，每0.01s跳一次 
    id=window.setInterval(tip,10); 
  }else{ 
    //使按钮文本变为开始 
    this.value="开始"; 
    //使重置按钮可用 
    btnReset.disabled=false; 
    //取消定时 
    window.clearInterval(id); 
  } 
} 
//重置按钮 
btnReset.onclick=function(){ 
  seed=0; 
} 
//让秒表跳一格 
function tip(){ 
  seed++; 
  txt.value=seed/100; 
} 
//--> 
</script>

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I hope this article will be helpful to everyone learning JavaScript programming.