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Make minute and second countdown timer with JS

怪我咯Original: 2017-06-29 10:47:412439browse

This article mainly introduces the implementation method of JavaScript, which can achieve the effect of counting down according to milliseconds. It has certain reference value. Friends in need can refer to this article

The example describes the implementation method of JavaScript minute and second countdown timer. Share it with everyone for your reference. The specific analysis is as follows:

1. Basic goal

Design a minute and second countdown timer in JavaScript. Once the time is completed, the button will become unclickablestate

The specific effect is as shown below. In order to illustrate the problem, it is adjusted to jump the table every 50 milliseconds, that is, every 0.05.

When actually used, setInterval("clock.move()",50); in window.onload=function(){...} can be adjusted from 50 to 1000.

The button can still be clicked before the time runs out.

After the time runs out, the button cannot be clicked.

2. Production process

The code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>time remaining</title>  
</head>  
<!--html部分很简单，需要被javascript控制的行内文本与提交按钮都被编上ID-->
<body>  
剩余时间：<span id="timer"></span>  
<input id="go" type="submit" value="go" />  
</body>  
</html>  
<script>  
/*主函数要使用的函数，进行声明*/  
var clock=new clock();  
/*指向计时器的指针*/  
var timer;  
window.onload=function(){  
    /*主函数就在每50秒调用1次clock函数中的move方法即可*/  
    timer=setInterval("clock.move()",50);  
    }  
function clock(){  
    /*s是clock()中的
变量
，非var那种全局变量，代表剩余秒数*/  
    this.s=140;  
    this.move=function(){  
        /*输出前先调用exchange函数进行秒到分秒的转换，因为exchange并非在主函数window.onload使用，因此不需要进行声明*/  
        
document
.getElementById("timer").innerHTML=exchange(this.s);  
        /*每被调用一次，剩余秒数就自减*/  
        this.s=this.s-1;  
        /*如果时间耗尽，那么，弹窗，使按钮不可用，停止不停调用clock函数中的move()*/  
        if(this.s<0){  
            alert("时间到");  
            document.getElementById("go").disabled=true;  
            clearTimeout(timer);  
            }  
        }  
    }  
function exchange(time){  
    /*javascript的除法是浮点除法，必须使用Math.floor取其
整数
部分*/  
        this.m=Math.floor(time/60);  
        /*存在取余运算*/  
        this.s=(time%60);  
        this.text=this.m+"分"+this.s+"秒";  
        /*传过来的形式参数time不要使用this，而其余在本函数使用的变量则必须使用this*/  
        return this.text;  
}  
</script>

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