你如何在计时器中调用启动和停止功能
How do you call the start and stop function in a timer
你好,我不久前在 SO 上发现了一个很棒的计时器,我想知道如何调用启动和停止函数,所以当你调用启动函数时,计时器启动,当你调用停止函数时计时器停止。我已经尝试了很多不同的解决方案,但无论如何我还是无法弄清楚这里是代码:
<!DOCTYPE html>
<html>
<head>
<title>JS Bin</title>
<style>
.stopwatch {
display: inline-block;
background-color: white;
border: 1px solid #eee;
padding: 5px;
margin: 5px;
}
.stopwatch span {
font-weight: bold;
display: block;
}
.stopwatch a {
padding-right: 5px;
text-decoration: none;
}
</style>
</head>
<body>
<h2>Basic example; update every 1 ms</h2>
<p>click <code>start</code> to start a stopwatch</p>
<pre>
var elems = document.getElementsByClassName("basic");
for (var i=0, len=elems.length; i<len; i++) {
new Stopwatch(elems[i]);
}
</pre>
<div class="basic stopwatch"></div>
<hr>
<script>
var Stopwatch = function(elem, options) {
var timer = createTimer(),
startButton = createButton("start", start),
stopButton = createButton("stop", stop),
resetButton = createButton("reset", reset),
offset,
clock,
interval;
// default options
options = options || {};
options.delay = options.delay || 1;
// append elements
elem.appendChild(timer);
elem.appendChild(startButton);
elem.appendChild(stopButton);
elem.appendChild(resetButton);
// initialize
reset();
// private functions
function createTimer() {
return document.createElement("span");
}
function createButton(action, handler) {
var a = document.createElement("a");
a.href = "#" + action;
a.innerHTML = action;
a.addEventListener("click", function(event) {
handler();
event.preventDefault();
});
return a;
}
function start() {
if (!interval) {
offset = Date.now();
interval = setInterval(update, options.delay);
}
}
function stop() {
if (interval) {
clearInterval(interval);
interval = null;
}
}
function reset() {
clock = 0;
render(0);
}
function update() {
clock += delta();
render();
}
function render() {
timer.innerHTML = clock/1000;
}
function delta() {
var now = Date.now(),
d = now - offset;
offset = now;
return d;
}
// public API
this.start = start;
this.stop = stop;
this.reset = reset;
};
// basic examples
var elems = document.getElementsByClassName("basic");
for (var i=0, len=elems.length; i<len; i++) {
new Stopwatch(elems[i]);
}
</script>
</body>
</html>
如果您查看代码,您会发现每个按钮都是使用以下函数创建的:
function createButton(action, handler) {
var a = document.createElement("a");
a.href = "#" + action;
a.innerHTML = action;
a.addEventListener("click", function(event) {
handler();
event.preventDefault();
});
return a;
}
所有这一切都是将一系列链接附加到 DOM,每个链接都有一个单击事件处理程序调用相关函数(作为 handler
变量传递)、停止、启动或重置。
要直接调用其中一个,您只需调用该函数即可 - 例如stop()
var Stopwatch = {
init: function(elem, options) {
var timer = createTimer(),
startButton = createButton("start", start),
stopButton = createButton("stop", stop),
resetButton = createButton("reset", reset),
offset,
clock,
interval;
// default options
options = options || {};
options.delay = options.delay || 1;
// append elements
elem.appendChild(timer);
elem.appendChild(startButton);
elem.appendChild(stopButton);
elem.appendChild(resetButton);
// initialize
reset();
// private functions
function createTimer() {
return document.createElement("span");
}
function createButton(action, handler) {
var a = document.createElement("a");
a.href = "#" + action;
a.innerHTML = action;
a.addEventListener("click", function(event) {
handler();
event.preventDefault();
});
return a;
}
function start() {
if (!interval) {
offset = Date.now();
interval = setInterval(update, options.delay);
}
}
function stop() {
if (interval) {
clearInterval(interval);
interval = null;
}
}
function reset() {
clock = 0;
render(0);
}
function update() {
clock += delta();
render();
}
function render() {
timer.innerHTML = clock / 1000;
}
function delta() {
var now = Date.now(),
d = now - offset;
offset = now;
return d;
}
// public API
this.start = start;
this.stop = stop;
this.reset = reset;
}
};
// basic examples
var elems = document.getElementsByClassName("basic");
for (var i = 0, len = elems.length; i < len; i++) {
Stopwatch.init(elems[i]);
}
.stopwatch {
display: inline-block;
background-color: white;
border: 1px solid #eee;
padding: 5px;
margin: 5px;
}
.stopwatch span {
font-weight: bold;
display: block;
}
.stopwatch a {
padding-right: 5px;
text-decoration: none;
}
<div class="basic stopwatch"></div>
<button onclick="Stopwatch.stop()">STOP!</button>
你好,我不久前在 SO 上发现了一个很棒的计时器,我想知道如何调用启动和停止函数,所以当你调用启动函数时,计时器启动,当你调用停止函数时计时器停止。我已经尝试了很多不同的解决方案,但无论如何我还是无法弄清楚这里是代码:
<!DOCTYPE html>
<html>
<head>
<title>JS Bin</title>
<style>
.stopwatch {
display: inline-block;
background-color: white;
border: 1px solid #eee;
padding: 5px;
margin: 5px;
}
.stopwatch span {
font-weight: bold;
display: block;
}
.stopwatch a {
padding-right: 5px;
text-decoration: none;
}
</style>
</head>
<body>
<h2>Basic example; update every 1 ms</h2>
<p>click <code>start</code> to start a stopwatch</p>
<pre>
var elems = document.getElementsByClassName("basic");
for (var i=0, len=elems.length; i<len; i++) {
new Stopwatch(elems[i]);
}
</pre>
<div class="basic stopwatch"></div>
<hr>
<script>
var Stopwatch = function(elem, options) {
var timer = createTimer(),
startButton = createButton("start", start),
stopButton = createButton("stop", stop),
resetButton = createButton("reset", reset),
offset,
clock,
interval;
// default options
options = options || {};
options.delay = options.delay || 1;
// append elements
elem.appendChild(timer);
elem.appendChild(startButton);
elem.appendChild(stopButton);
elem.appendChild(resetButton);
// initialize
reset();
// private functions
function createTimer() {
return document.createElement("span");
}
function createButton(action, handler) {
var a = document.createElement("a");
a.href = "#" + action;
a.innerHTML = action;
a.addEventListener("click", function(event) {
handler();
event.preventDefault();
});
return a;
}
function start() {
if (!interval) {
offset = Date.now();
interval = setInterval(update, options.delay);
}
}
function stop() {
if (interval) {
clearInterval(interval);
interval = null;
}
}
function reset() {
clock = 0;
render(0);
}
function update() {
clock += delta();
render();
}
function render() {
timer.innerHTML = clock/1000;
}
function delta() {
var now = Date.now(),
d = now - offset;
offset = now;
return d;
}
// public API
this.start = start;
this.stop = stop;
this.reset = reset;
};
// basic examples
var elems = document.getElementsByClassName("basic");
for (var i=0, len=elems.length; i<len; i++) {
new Stopwatch(elems[i]);
}
</script>
</body>
</html>
如果您查看代码,您会发现每个按钮都是使用以下函数创建的:
function createButton(action, handler) {
var a = document.createElement("a");
a.href = "#" + action;
a.innerHTML = action;
a.addEventListener("click", function(event) {
handler();
event.preventDefault();
});
return a;
}
所有这一切都是将一系列链接附加到 DOM,每个链接都有一个单击事件处理程序调用相关函数(作为 handler
变量传递)、停止、启动或重置。
要直接调用其中一个,您只需调用该函数即可 - 例如stop()
var Stopwatch = {
init: function(elem, options) {
var timer = createTimer(),
startButton = createButton("start", start),
stopButton = createButton("stop", stop),
resetButton = createButton("reset", reset),
offset,
clock,
interval;
// default options
options = options || {};
options.delay = options.delay || 1;
// append elements
elem.appendChild(timer);
elem.appendChild(startButton);
elem.appendChild(stopButton);
elem.appendChild(resetButton);
// initialize
reset();
// private functions
function createTimer() {
return document.createElement("span");
}
function createButton(action, handler) {
var a = document.createElement("a");
a.href = "#" + action;
a.innerHTML = action;
a.addEventListener("click", function(event) {
handler();
event.preventDefault();
});
return a;
}
function start() {
if (!interval) {
offset = Date.now();
interval = setInterval(update, options.delay);
}
}
function stop() {
if (interval) {
clearInterval(interval);
interval = null;
}
}
function reset() {
clock = 0;
render(0);
}
function update() {
clock += delta();
render();
}
function render() {
timer.innerHTML = clock / 1000;
}
function delta() {
var now = Date.now(),
d = now - offset;
offset = now;
return d;
}
// public API
this.start = start;
this.stop = stop;
this.reset = reset;
}
};
// basic examples
var elems = document.getElementsByClassName("basic");
for (var i = 0, len = elems.length; i < len; i++) {
Stopwatch.init(elems[i]);
}
.stopwatch {
display: inline-block;
background-color: white;
border: 1px solid #eee;
padding: 5px;
margin: 5px;
}
.stopwatch span {
font-weight: bold;
display: block;
}
.stopwatch a {
padding-right: 5px;
text-decoration: none;
}
<div class="basic stopwatch"></div>
<button onclick="Stopwatch.stop()">STOP!</button>