<h1>
定时器
</h1>
<input id="btn1" type="button" value="开始计时"/>
<input id="btn2" type="button" value="结束计时"/>
<p id="p2">
<span id="h1"></span>:<span id="m1"></span>:<span id="s1"></span>
</p>
//定时器
var s = "00";
var m = '00';
var h = '00';
var i = 0;
var k = 0;
document.getElementById('h1').innerText = h;
document.getElementById('m1').innerText = m;
document.getElementById('s1').innerText = s;
var btn3 = document.getElementById('btn1');
btn3.onclick = function(){
var j = 0;
readytrick = setInterval(function(){
j++;
if(j<60){
document.getElementById('s1').innerText = toDate(j);
}else{
j = 0;
readytrick;
minutes();
}
},1000)
};
function minutes(){
i++;
if(i<60){
document.getElementById('m1').innerText = toDate(i);
}else{
hours();
i = 0;
}
}
function hours(){
k++;
if(k<12){
document.getElementById('h1').innerText = toDate(k);
}else{
k= 0;
}
}
var btn4 = document.getElementById('btn2');
btn4.onclick = function(){
clearInterval(readytrick);
}