2015-04-12 20:15:25
方法一;
<script>
var s=0;
var timeout=0;
status=‘点击按钮，开始计时‘;
function count(){
s++;
time1.value=s;
timeout=setTimeout(‘count();‘,100);
}
function onChange(){
if(timeout==0){
count();
time2.value=‘暂停计时‘;
status=‘点击按钮，暂停计时‘;
}else{
clearTimeout(timeout);
timeout=0;
time2.value=‘继续计时‘;
status=‘单击按钮，继续计时‘;
}
}
</script>
</head>
<body>
<input name=‘time1‘/><br/>
<input type=‘button‘ name=‘time2‘ onclick=‘onChange();‘ value=‘开始计时‘/>
</body>
第二种方法：
<body>
<input id=‘text1‘/>
<input type=‘button‘ id=‘jishi‘ value=‘开始计时‘ onclick=‘getTim();‘/>
<script>
var jishi=null,text1=null,k=0,timer=null;
function getTim(){
var jishi=document.getElementById("jishi");
var text1=document.getElementById("text1");
switch(jishi.value){
case ‘开始计时‘:window.status=‘单击按钮，开始计时‘;
case ‘继续计时‘:
jishi.value=‘单击暂停‘;
window.status=‘‘;
timer=setInterval(function(){
text1.value=k;
k++;
},5);break;
case ‘单击暂停‘:
window.status=‘单击按钮，开始计时‘;
clearInterval(timer);
jishi.value=‘继续计时‘;break;
default:break;
}
}
</script>
</body>
原文：http://www.cnblogs.com/xiaotudou-datudou/p/4420438.html