js倒计时器可自定义时间和暂停，效果如下，点击start 开始计时，end结束计时
分别复制 H5 css js 代码即可实现，具体的算法在js控制函数中（都写了注释）
css
html,body{
width:100%;height:100%;
}
.content{
height:100%;width:100%;
}
.row-center{
display:flex;flex-direction:row;justify-content:center;
align-items:center;
}
.tc-input-style{
outline:none;border:none;width:20%;height:80%;border-radius:10px;
}
.tc-span-style{
width:30%;height:100%;font-weight:bold;
}
.tc-font-style{
font-size:15px;font-weight:bold;
}
.tc-div-style1{
height:33%;width:100%
}
.tc-div-style0{
height:30%;width:100%
}
.tc-div-style2{
height:10%;width:100%;
}
.tc-div-style3{
height:100%;width:30%
}
.column-center{
display:flex;flex-direction:column;justify-content:center;
align-items:center;
}
.column-start-center{
display:flex;flex-direction:column;justify-content:flex-start;
align-items:center;
}
#timecount{
height:50%;width:20%;
}
.button-style-0{
border-radius:10px;
}
.row-space-around{
display:flex;flex-direction:row;justify-content:space-around;
align-items:center;
}
h6
<body>
<div class="content row-center">
<div id="timecount" class="column-center tc-font-style" >
<div class="column-start-center tc-div-style0" >
<div class="row-center tc-div-style1" ><span class="tc-span-style row-center">小时:</span><input class=tc-input-style id="hour_count" value="0"> </div>
<div class="row-center tc-div-style1" ><span class="tc-span-style row-center">分钟:</span><input class=tc-input-style id="minute_count" value="0"> </div>
<div class="row-center tc-div-style1" ><span class="tc-span-style row-center">秒:</span><input class=tc-input-style id="second_count" value="0"> </div>
</div>
<div class="row-center tc-div-style2">
<div class="row-center tc-div-style3" id="hour_show" ></div>
<div class="row-center tc-div-style3" id="minute_show"></div>
<div class="row-center tc-div-style3" id="second_show"></div>
</div>
<div class="row-space-around tc-div-style2">
<button class="button-style-0" onclick="timecounts()">start</button>
<button class="button-style-0" onclick="timestop()">stop</button>
</div>
</div>
</div>
</body>
记得引入jq
<script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
JS
<script type="text/javascript">
var timecount;//定义一个全局变量
function timer(intDiff){
//定义一个循环函数每一秒定时执行
timecount=setInterval(function(){
var hour=0,
minute=0,
second=0;//初始化时间默认值
//算法控制
if(intDiff > 0){
hour = Math.floor(intDiff / (60 * 60)) ;
minute = Math.floor(intDiff / 60) - (hour * 60);
second = Math.floor(intDiff) - (hour * 60 * 60) - (minute * 60);
}
if (minute <= 9) minute = '0' + minute;
if (second <= 9) second = '0' + second;
//打印到dom
$('#hour_show').html('<s id="h"></s>'+hour+'时');
$('#minute_show').html('<s></s>'+minute+'分');
$('#second_show').html('<s></s>'+second+'秒');
intDiff--;
}, 1000);
console.log(intDiff);
}
function timecounts(){
console.log($("#hour_count").val())
count=parseInt($("#hour_count").val()*3600)+parseInt($("#minute_count").val()*60)+parseInt($("#second_count").val())
timer(count);//调用计时器函数
console.log(count);
}
function timestop(){
var hour= $("#hour_show").text();
var minute= $("#minute_show").text();
var second= $("#second_show").text();
var time=parseInt($("#hour_show").text())*3600+parseInt($("#minute_show").text())*60+parseInt($("#second_show").text())
console.log(time);
timecount=window.clearInterval(timecount);//停止计时器
}
</script>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持天达云。