html如何实现计数器以及时钟的功能代码-木庄网络博客

本文摘自PHP中文网，作者不言，侵删。

本篇文章给大家带来的内容是关于html如何实现计数器以及时钟的功能代码，有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。

在许多的网页中，我们都会看到计数器以及时钟，那么我们怎么自己实现着种功能呢？

先说计数器，计数器的逻辑功能很简单，就是秒针每秒加一，逢60进一就可以。代码如下：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <div></div>
        <script>
            var index = 0;
            var i=0;
             
            /**
             * 对时间进行预先处理，逢60进一
             */
            function counter(){
                second = index;
                minute=i;
                index++;
                if(second==60){
                    second=0;
                    i++;
                    index=0;
                }
                if(second<10){
                    second = "0"+second;
                }
                if(minute<10){
                    minute="0"+minute;
                }
                return time = minute +":"+second;
            }
             
            /**
             * 将获得的时间插入到div的区域
             */
            function show(){
                var time = counter();
                document.getElementsByTagName("div")[0].innerHTML=time;
            }
             
            /**
             * 每秒钟获得一次时间，实现计数功能
             */
            function set(){
                setInterval("show()",1000);
            }
             
            show();
            set();
        </script>
    </body>
</html>

这样，一个简单的计数器就完成了。

时钟功能的代码：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <script>
            /**
             * 向Date类中添加获取当前时间的方法
             */
            Date.prototype.currentTime = function(){
                var year = this.getFullYear();
                var month = this.getMonth()+1;
                var day = this.getDate();
                var week = this.getDay();
                week = "星期"+"日一二三四五六".charAt(week);
                month = month<10 ? "0"+month : month;
                day = day < 10 ? "0"+day : day;
                var hour = this.getHours();
                var second = this.getSeconds();
                var minute = this.getMinutes();
                hour = hour<10 ? "0"+hour : hour;
                second = second < 10 ? "0"+second : second;
                minute = minute < 10 ? "0"+minute : minute;
                return year+"-"+month+"-"+day+" "+week+" "+hour+":"+minute+":"+second;
            }
             
            function showTime(){
                var time = new Date().currentTime();
                document.getElementById("show").innerHTML = time;
            }
             
            function setTime(){
                showTime();
                setInterval("showTime()",1000);
            }
            window.onload = function(){
                setTime();
            }
             
        </script>
    </head>
    <body>
        <span id="show"></span>
         
    </body>
</html>