<script?type="text/javascript">
????var?num=0;
????var?i;
????function?startCount(){
????????//每次開始前,先判斷是否也有一個定時在執(zhí)行,如果有就清除掉
????????if(i){
????????????clearTimeout(i);
????????}
????????var?input?=?document.getElementById('count');
????????num?=?parseInt(input.value)?||?num;
????????num=num+1;
????????input.value?=?num;
????????i=setTimeout("startCount()",1000);
????}
????function?stopCount(){
????????clearTimeout(i)
????}
</script>

因為重復點擊開始就是重復開啟定時器，多個定時器同時運行 就會孌快