body {
font-family:"微软雅黑";
margin:20px;
padding:0;
text-align:center;
}
input {
position:relative;
left:50%;
transform:translateX(-50%);
padding:10px 20px;
display:block;
outline:none;
background-color:#FFFFFF;
border:1px solid #000000;
cursor:pointer;
margin-top:15px;
font-size:18px;
font-family:"微软雅黑";
transition:all 0.15s;
}
input:hover,input:hover {
background-color:#333333;
color:#FFFFFF;
}
用js实现计时器的暂停继续功能,结束计时清零