[英]How do I make a HTML count up timer with the days:minutes:seconds without resetting on page refresh?
[英]How do I script a function to add seconds to a JavaScript count up timer displaying in HTML?
我找到了一个满足我需要的示例 JavaScript 计数计时器,包括启动/暂停和重置功能。 但是,它缺少我需要做的一件事; 让脚本在选择按钮时向显示计时器添加 2 秒。
这是我的 HTML:
<!doctype html>
<html>
<head>
<title></title>
</head>
<p><span id="my_timer" style="color: #f00; font-size: 2000%; font-weight: bold;">00:00:00</span></p>
<button id="control" onclick="changeState();">START</button>
<button id="reset" onClick="reset();">RESET</button>
<button id="updateClock" onClick="updateClock();">2 SECONDS</button>
<script type="text/javascript" src="timer.js"></script>
<body>
</body>
</html>
这是我的 JavaScript:
// boolean keeps track of timer state
var active = false;
//main function
function start_timer() {
//function active if true
if (active) {
var timer = document.getElementById("my_timer").innerHTML;
var arr = timer.split(":"); //spliting timer into array by ':', so hour goes to arr[0], minutes go to arr[1], etc.
var hour = arr[0]; //getting hour
var min = arr[1]; //minutes
var sec = arr[2]; //seconds
if (sec == 59) {
if (min == 59) {
hour++;
min = 0;
if (hour < 10) hour ="0" + hour;
} else {
min++;
}
if (min < 10) min = "0" + min;
sec = 0;
} else {
sec ++;
if (sec < 10) sec = "0" + sec;
}
//update our html
document.getElementById("my_timer").innerHTML = hour + ":" + min + ":" + sec;
setTimeout(start_timer, 1000); //repeat with speed of 1 second
}
}
//functions to change states - start or pause timer by clicking
function changeState () {
if (active == false) {
active = true;
start_timer();
console.log("Timer has been started");
document.getElementById("control").innerHTML = "PAUSE";
} else {
active = false;
console.log("Timer is on pause");
document.getElementById("control").innerHTML = "START";
}
}
//reset function
function reset() {
document.getElementById("my_timer").innerHTML = "00" + ":" + "00" + ":" + "00";
console.log("Timer has been reset");
}
我将如何编写一个可以为显示计时器增加 2 秒的函数?
以下仅在计时器运行时有效。 无论计时器是否正在运行,要让按钮添加两秒,请删除“if (active){”。
// add two seconds to displayed time
function start_timer(){
if (active) {
var timer = document.getElementById("my_timer").innerHTML;
var arr = timer.split(":"); //spliting timer into array by ':', so hour goes to arr[0], minutes go to arr[1], etc.
var hour = arr[0]; //getting hour
var min = arr[1]; //minutes
var sec = arr[2]; //seconds
if ((sec == 58) || (sec == 59)) {
if (min == 59) {
hour++;
min = 0;
if (hour < 10) hour ="0" + hour;
} else {
min++;
}
if (min < 10) min = "0" + min;
if (sec == 58){
sec = 0;
}
if (sec == 59){
sec = 1;
}
} else {
sec = parseInt(sec) + 2;
if (sec < 10) sec = "0" + sec;
}
//update our html
document.getElementById("my_timer").innerHTML = hour + ":" + min + ":" + sec;
}
}
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