Question

我在JavaScript方面不太好，如果日期过期而不是打印确切的过期日期，我需要这个倒计时代码在4个圆圈中打印0 ..

倒计时是由用户NoelPeña制作的Codepen（当然感谢他这个惊人的倒计时）：http://codepen.io/ewganoel/pen/AIGcE

这是JavaScript代码：

var ringer = {
countdown_to: "10/10/2014",
rings: {
'DAYS': {
s: 86400000, // mseconds in a day,
max: 365
},
'HOURS': {
s: 3600000, // mseconds per hour,
max: 24
},
'MINUTES': {
s: 60000, // mseconds per minute
max: 60
},
'SECONDS': {
s: 1000,
max: 60
},
'MICROSEC': {
s: 10,
max: 100
}
},
r_count: 5,
r_spacing: 10, // px
r_size: 100, // px
r_thickness: 5, // px
update_interval: 11, // ms


init: function(){

$r = ringer;
$r.cvs = document.createElement('canvas');

$r.size = {
w: ($r.r_size + $r.r_thickness) * $r.r_count + ($r.r_spacing*($r.r_count-1)),
h: ($r.r_size + $r.r_thickness)
};



$r.cvs.setAttribute('width',$r.size.w);
$r.cvs.setAttribute('height',$r.size.h);
$r.ctx = $r.cvs.getContext('2d');
$(".countdownwrap").append($r.cvs);
$r.cvs = $($r.cvs);
$r.ctx.textAlign = 'center';
$r.actual_size = $r.r_size + $r.r_thickness;
$r.countdown_to_time = new Date($r.countdown_to).getTime();
$r.cvs.css({ width: $r.size.w+"px", height: $r.size.h+"px" });
$r.go();
},
ctx: null,
go: function(){
var idx=0;

$r.time = (new Date().getTime()) - $r.countdown_to_time;


for(var r_key in $r.rings) $r.unit(idx++,r_key,$r.rings[r_key]);

setTimeout($r.go,$r.update_interval);
},
unit: function(idx,label,ring) {
var x,y, value, ring_secs = ring.s;
value = parseFloat($r.time/ring_secs);
$r.time-=Math.round(parseInt(value)) * ring_secs;
value = Math.abs(value);

x = ($r.r_size*.5 + $r.r_thickness*.5);
x +=+(idx*($r.r_size+$r.r_spacing+$r.r_thickness));
y = $r.r_size*.5;
y += $r.r_thickness*.5;


// calculate arc end angle
var degrees = 360-(value / ring.max) * 360.0;
var endAngle = degrees * (Math.PI / 180);

$r.ctx.save();

$r.ctx.translate(x,y);
$r.ctx.clearRect($r.actual_size*-0.5,$r.actual_size*-0.5,$r.actual_size,$r.actual_size);

// first circle
$r.ctx.strokeStyle = "rgba(128,128,128,0.2)";
$r.ctx.beginPath();
$r.ctx.arc(0,0,$r.r_size/2,0,2 * Math.PI, 2);
$r.ctx.lineWidth =$r.r_thickness;
$r.ctx.stroke();

// second circle
$r.ctx.strokeStyle = "rgba(253, 128, 1, 0.9)";
$r.ctx.beginPath();
$r.ctx.arc(0,0,$r.r_size/2,0,endAngle, 1);
$r.ctx.lineWidth =$r.r_thickness;
$r.ctx.stroke();

// label
$r.ctx.fillStyle = "#000000";

$r.ctx.font = '12px Helvetica';
$r.ctx.fillText(label, 0, 23);
$r.ctx.fillText(label, 0, 23);

$r.ctx.font = 'bold 40px Helvetica';
$r.ctx.fillText(Math.floor(value), 0, 10);

$r.ctx.restore();
}
}

ringer.init();

非常感谢

Answer 1

只需将countdown_to时间更改为将来的日期。

并更新代码

if(((new Date().getTime()) - $r.countdown_to_time)<0)
     $r.time = (new Date().getTime()) - $r.countdown_to_time;
else $r.time = 0;

检查当前new Date().getTime()与countdown_to_time的差异是否大于零，然后将其设置为零。

这是一个例子，

var ringer = {
  countdown_to: "1/10/2017",
  rings: {
    'DAYS': {
      s: 86400000, // mseconds in a day,
      max: 365
    },
    'HOURS': {
      s: 3600000, // mseconds per hour,
      max: 24
    },
    'MINUTES': {
      s: 60000, // mseconds per minute
      max: 60
    },
    'SECONDS': {
      s: 1000,
      max: 60
    },
    'MICROSEC': {
      s: 10,
      max: 100
    }
  },
  r_count: 5,
  r_spacing: 10, // px
  r_size: 100, // px
  r_thickness: 5, // px
  update_interval: 11, // ms


  init: function() {

    $r = ringer;
    $r.cvs = document.createElement('canvas');

    $r.size = {
      w: ($r.r_size + $r.r_thickness) * $r.r_count + ($r.r_spacing * ($r.r_count - 1)),
      h: ($r.r_size + $r.r_thickness)
    };



    $r.cvs.setAttribute('width', $r.size.w);
    $r.cvs.setAttribute('height', $r.size.h);
    $r.ctx = $r.cvs.getContext('2d');
    $(".countdownwrap").append($r.cvs);
    $r.cvs = $($r.cvs);
    $r.ctx.textAlign = 'center';
    $r.actual_size = $r.r_size + $r.r_thickness;
    $r.countdown_to_time = new Date($r.countdown_to).getTime();
    $r.cvs.css({
      width: $r.size.w + "px",
      height: $r.size.h + "px"
    });
    $r.go();
  },
  ctx: null,
  go: function() {
    var idx = 0;

    if (((new Date().getTime()) - $r.countdown_to_time) < 0)
      $r.time = (new Date().getTime()) - $r.countdown_to_time;
    else $r.time = 0;

    for (var r_key in $r.rings) $r.unit(idx++, r_key, $r.rings[r_key]);


    setTimeout($r.go, $r.update_interval);
  },
  unit: function(idx, label, ring) {
    var x, y, value, ring_secs = ring.s;
    value = parseFloat($r.time / ring_secs);
    $r.time -= Math.round(parseInt(value)) * ring_secs;
    value = Math.abs(value);

    x = ($r.r_size * .5 + $r.r_thickness * .5);
    x += +(idx * ($r.r_size + $r.r_spacing + $r.r_thickness));
    y = $r.r_size * .5;
    y += $r.r_thickness * .5;


    // calculate arc end angle
    var degrees = 360 - (value / ring.max) * 360.0;
    var endAngle = degrees * (Math.PI / 180);

    $r.ctx.save();

    $r.ctx.translate(x, y);
    $r.ctx.clearRect($r.actual_size * -0.5, $r.actual_size * -0.5, $r.actual_size, $r.actual_size);

    // first circle
    $r.ctx.strokeStyle = "rgba(128,128,128,0.2)";
    $r.ctx.beginPath();
    $r.ctx.arc(0, 0, $r.r_size / 2, 0, 2 * Math.PI, 2);
    $r.ctx.lineWidth = $r.r_thickness;
    $r.ctx.stroke();

    // second circle
    $r.ctx.strokeStyle = "rgba(253, 128, 1, 0.9)";
    $r.ctx.beginPath();
    $r.ctx.arc(0, 0, $r.r_size / 2, 0, endAngle, 1);
    $r.ctx.lineWidth = $r.r_thickness;
    $r.ctx.stroke();

    // label
    $r.ctx.fillStyle = "#000000";

    $r.ctx.font = '12px Helvetica';
    $r.ctx.fillText(label, 0, 23);
    $r.ctx.fillText(label, 0, 23);

    $r.ctx.font = 'bold 40px Helvetica';
    $r.ctx.fillText(Math.floor(value), 0, 10);

    $r.ctx.restore();
  }
}

ringer.init();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div class="countdownwrap"></div>

如果日期过期，如何让这个javascript代码倒计时打印0-0-0-0？

1 个答案: