回答編集履歴
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コード修正および追記
answer
CHANGED
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@@ -1,2 +1,59 @@
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普通に拝借すればいいのではないでしょうか？
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[https://jsfiddle.net/0kupdr6j/](https://jsfiddle.net/0kupdr6j/)
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```HTML
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<div class="target"></div>
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```
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```jQuery
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const countdown_timer = function(){
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let mins = 30; // ここを変えれば指定の minutes にできます
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let secs = mins * 60;
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let msecs = secs * 1000;
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let start_date = new Date();
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let end_date = new Date(start_date.getTime() + msecs);
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let current_mins = 0;
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let current_secs = 0;
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let current_msecs = 0;
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$('.target').append(
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'<div class="countdown_timer">'
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+ '<p class="time">あと<span class="mins">'+mins+'</span>分<span class="secs">00</span>秒<span class="msecs">00</span></p>'
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+ '</div>'
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);
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if ((navigator.userAgent.indexOf('iPhone') > 0 || navigator.userAgent.indexOf('Android') > 0 && navigator.userAgent.indexOf('Mobile') > 0 || navigator.userAgent.indexOf('iPad') > 0 || navigator.userAgent.indexOf('Android') > 0)) {
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$('.text_attention').html('※このページが表示されてから、<br>60分間の限定割引になります。');
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}
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let timer = setInterval(function(){
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let now_date = new Date();
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current_mins = Math.floor(((end_date - now_date) % (24 * 60 * 60 * 1000)) / (60 * 1000)) % 60;
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current_secs = Math.floor(((end_date - now_date) % (24 * 60 * 60 * 1000)) / 1000) % 60 % 60;
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current_msecs = Math.floor(((end_date - now_date) % (24 * 60 * 60 * 1000)) / 10) % 100;
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if(current_mins <= 9) {
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current_mins = "0" + current_mins;
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}
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if(current_secs <= 9) {
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current_secs = "0" + current_secs;
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}
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if(current_msecs <= 9){
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current_msecs = "0" + current_msecs;
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}
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$(".time").html(
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'あと'
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+ '<span class="font_size_xl">' + current_mins + '</span>'
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+ '分'
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+ '<span class="font_size_xl">' + current_secs + '</span>'
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+ '秒'
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+ '<span class="font_size_xl">' + current_msecs + '</span>'
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);
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},10);
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}
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countdown_timer();
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```
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