我有两个问题，第一个问题是如何让这个倒计时具有响应性。我尝试使用 Bootstrap 使其具有响应性，但未能达到令人满意的结果。
注意:如果需要，您可以删除我的样式并从头开始。
第二个问题发生在当我将圆的半径从 70 更改为任何其他值时，当我更改倒计时圆的半径时，圆将像这样:
代码在这里:
(function($) {
jQuery.fn.countdown = function(options, callback) {
var settings = {
'date': null
};
if (options) {
$.extend(settings, options);
}
this_sel = $(this);
/*Canvas JavaScript*/
var canvas = document.getElementById('myCanvas');
var canvas1 = document.getElementById('myCanvas1');
var canvas2 = document.getElementById('myCanvas2');
var canvas3 = document.getElementById('myCanvas3');
var context = canvas.getContext('2d');
var context1 = canvas1.getContext('2d');
var context2 = canvas2.getContext('2d');
var context3 = canvas3.getContext('2d');
var centerX = canvas.width / 2;
var centerY = canvas.height / 2;
var radius = 90;
var sec_arc_end = 0,
min_arc_end = 0,
hour_arc_end = 0,
day_arc_end = 0;
function count_exec() {
eventDate = Date.parse(settings['date']) / 1000;
currentDate = Math.floor($.now() / 1000);
if (eventDate <= currentDate) {
callback.call(this);
clearInterval(interval);
}
seconds = eventDate - currentDate;
days = Math.floor(seconds / (60 * 60 * 24));
seconds -= days * 60 * 60 * 24;
hours = Math.floor(seconds / (60 * 60));
seconds -= hours * 60 * 60;
minutes = Math.floor(seconds / 60);
seconds -= minutes * 60;
// seconds arc canvas...................
context.clearRect(50, 50, canvas.width, canvas.height);
sec_arc_end = ((60 - seconds) * parseFloat(0.10472));
context.beginPath();
context.arc(centerX, centerY, radius, 1.5 * Math.PI, 1.5 * Math.PI + sec_arc_end, false);
context.lineWidth = 8;
context.strokeStyle = '#14E170';
context.stroke();
// minutes arc canvas...................
context1.clearRect(50, 50, canvas.width, canvas.height);
min_arc_end = ((60 - minutes) * parseFloat(0.10471));
context1.beginPath();
context1.arc(centerX, centerY, radius, 1.5 * Math.PI, 1.5 * Math.PI + min_arc_end, false);
context1.lineWidth = 8;
context1.strokeStyle = '#14E170';
context1.stroke();
// hours arc canvas...................
context2.clearRect(50, 50, canvas.width, canvas.height);
hour_arc_end = ((24 - hours) * parseFloat((0.10471 * 5) / 2));
context2.beginPath();
context2.arc(centerX, centerY, radius, 1.5 * Math.PI, 1.5 * Math.PI + hour_arc_end, false);
context2.lineWidth = 8;
context2.strokeStyle = '#14E170';
context2.stroke();
// days arc canvas...................
if (days > 364) {
$('#myCanvas3').hide();
}
context3.clearRect(50, 50, canvas.width, canvas.height);
day_arc_end = ((-days) * parseFloat((0.10471 * 5) / 2)); // the problem is here
context3.beginPath();
context3.arc(centerX, centerY, radius, -0.5 * Math.PI, (((365 - days) / 365) * 2 - 0.5) * Math.PI, false);
context3.lineWidth = 8;
context3.strokeStyle = '#14E170';
context3.stroke();
// add 0 value to left of value
if (!isNaN(eventDate)) {
this_sel.find('.days').text(days);
this_sel.find('.hours').text(hours);
this_sel.find('.mins').text(minutes);
this_sel.find('.secs').text(seconds);
}
}
count_exec();
console.log(days);
interval = setInterval(count_exec, 1000);
};
})(jQuery);
$(document).ready(function () {
$("#countdown").countdown({
date: "6 january 2018 6:34:00"
},
function () {
$("#countdown").text("merry christmas");
}
);
/*Make Canvas Responsive*/
$(".countdown-container").height($(".countdown-container").width());
$(window).resize(function () {
$(".countdown-container").height($(".countdown-container").width());
});
})#countdown {
width: 100%;
padding: 5px;
}
.countdown-container {
width: 24%;
height: 97%;
text-align: center;
}
#countdown .countdown-container {
text-align: center;
float: left;
position: relative;
margin: 0.30% 0.5% 0.30% 0.5%;
}
#countdown .countdown-container .contents {
margin: 0;
position: absolute;
top: 50%;
left: 50%;
margin-right: -50%;
transform: translate(-50%, -50%);
font-size-adjust: 0.58;
}
.contents div {
font-size: 28px;
}
.contents span {
font-size: 16px;
}
canvas {
width: 100%;
height: 100%;
border:1px solid #06ee7c;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="countdown">
<div class="countdown-container">
<div class="contents">
<div class="secs">
00
</div>
<span>Seconds</span>
</div>
<canvas id="myCanvas" width="250" height="250"></canvas>
</div>
<div class="countdown-container">
<div class="contents">
<div class="mins">
00
</div>
<span>Minutes</span>
</div>
<canvas id="myCanvas1" width="250" height="250"></canvas>
</div>
<div class="countdown-container">
<div class="contents">
<div class="hours">
00
</div>
<span>Hours</span>
</div>
<canvas id="myCanvas2" width="250" height="250"></canvas>
</div>
<div class="countdown-container">
<div class="contents">
<div class="days">
00
</div>
<span>Days</span>
</div>
<canvas id="myCanvas3" width="250" height="250"></canvas>
</div>
</div>注意:
- 请在整页运行代码
- 等待1分钟后每次session出现半径问题
最佳答案
使用 clearRect(0,0,width,height) 代替 clearRect(50,50,width,height)。
(function($) {
jQuery.fn.countdown = function(options, callback) {
var settings = {
'date': null
};
if (options) {
$.extend(settings, options);
}
this_sel = $(this);
/*Canvas JavaScript*/
var canvas = document.getElementById('myCanvas');
var canvas1 = document.getElementById('myCanvas1');
var canvas2 = document.getElementById('myCanvas2');
var canvas3 = document.getElementById('myCanvas3');
var context = canvas.getContext('2d');
var context1 = canvas1.getContext('2d');
var context2 = canvas2.getContext('2d');
var context3 = canvas3.getContext('2d');
var centerX = canvas.width / 2;
var centerY = canvas.height / 2;
var radius = 90;
var sec_arc_end = 0,
min_arc_end = 0,
hour_arc_end = 0,
day_arc_end = 0;
function count_exec() {
eventDate = Date.parse(settings['date']) / 1000;
currentDate = Math.floor($.now() / 1000);
if (eventDate <= currentDate) {
callback.call(this);
clearInterval(interval);
}
seconds = eventDate - currentDate;
days = Math.floor(seconds / (60 * 60 * 24));
seconds -= days * 60 * 60 * 24;
hours = Math.floor(seconds / (60 * 60));
seconds -= hours * 60 * 60;
minutes = Math.floor(seconds / 60);
seconds -= minutes * 60;
// seconds arc canvas...................
context.clearRect(0, 0, canvas.width, canvas.height);
sec_arc_end = ((60 - seconds) * parseFloat(0.10472));
context.beginPath();
context.arc(centerX, centerY, radius, 1.5 * Math.PI, 1.5 * Math.PI + sec_arc_end, false);
context.lineWidth = 8;
context.strokeStyle = '#14E170';
context.stroke();
// minutes arc canvas...................
context1.clearRect(0, 0, canvas.width, canvas.height);
min_arc_end = ((60 - minutes) * parseFloat(0.10471));
context1.beginPath();
context1.arc(centerX, centerY, radius, 1.5 * Math.PI, 1.5 * Math.PI + min_arc_end, false);
context1.lineWidth = 8;
context1.strokeStyle = '#14E170';
context1.stroke();
// hours arc canvas...................
context2.clearRect(0, 0, canvas.width, canvas.height);
hour_arc_end = ((24 - hours) * parseFloat((0.10471 * 5) / 2));
context2.beginPath();
context2.arc(centerX, centerY, radius, 1.5 * Math.PI, 1.5 * Math.PI + hour_arc_end, false);
context2.lineWidth = 8;
context2.strokeStyle = '#14E170';
context2.stroke();
// days arc canvas...................
if (days > 364) {
$('#myCanvas3').hide();
}
context3.clearRect(0, 0, canvas.width, canvas.height);
day_arc_end = ((-days) * parseFloat((0.10471 * 5) / 2)); // the problem is here
context3.beginPath();
context3.arc(centerX, centerY, radius, -0.5 * Math.PI, (((365 - days) / 365) * 2 - 0.5) * Math.PI, false);
context3.lineWidth = 8;
context3.strokeStyle = '#14E170';
context3.stroke();
// add 0 value to left of value
if (!isNaN(eventDate)) {
this_sel.find('.days').text(days);
this_sel.find('.hours').text(hours);
this_sel.find('.mins').text(minutes);
this_sel.find('.secs').text(seconds);
}
}
count_exec();
console.log(days);
interval = setInterval(count_exec, 1000);
};
})(jQuery);
$(document).ready(function () {
$("#countdown").countdown({
date: "6 january 2018 6:34:00"
},
function () {
$("#countdown").text("merry christmas");
}
);
/*Make Canvas Responsive*/
$(".countdown-container").height($(".countdown-container").width());
$(window).resize(function () {
$(".countdown-container").height($(".countdown-container").width());
});
})#countdown {
width: 100%;
padding: 5px;
}
.countdown-container {
width: 24%;
height: 97%;
text-align: center;
}
#countdown .countdown-container {
text-align: center;
float: left;
position: relative;
margin: 0.30% 0.5% 0.30% 0.5%;
}
#countdown .countdown-container .contents {
margin: 0;
position: absolute;
top: 50%;
left: 50%;
margin-right: -50%;
transform: translate(-50%, -50%);
font-size-adjust: 0.58;
}
.contents div {
font-size: 28px;
}
.contents span {
font-size: 16px;
}
canvas {
width: 100%;
height: 100%;
border:1px solid #06ee7c;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="countdown">
<div class="countdown-container">
<div class="contents">
<div class="secs">
00
</div>
<span>Seconds</span>
</div>
<canvas id="myCanvas" width="250" height="250"></canvas>
</div>
<div class="countdown-container">
<div class="contents">
<div class="mins">
00
</div>
<span>Minutes</span>
</div>
<canvas id="myCanvas1" width="250" height="250"></canvas>
</div>
<div class="countdown-container">
<div class="contents">
<div class="hours">
00
</div>
<span>Hours</span>
</div>
<canvas id="myCanvas2" width="250" height="250"></canvas>
</div>
<div class="countdown-container">
<div class="contents">
<div class="days">
00
</div>
<span>Days</span>
</div>
<canvas id="myCanvas3" width="250" height="250"></canvas>
</div>
</div>关于javascript - 使 Arc Canvas 响应，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41540984/