任務(wù)提問(wèn)！
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>定時(shí)器</title>
<script type="text/javascript">
? var attime;
? function clock(){
??? var time=new Date();???????? ?
??? attime= time.getHours()+":"+time.getMinutes()+":"+time.getSeconds();
??? document.getElementById("clock").value = attime;
? }
? setInterval("clock()",1000);
?? //setInterval("clock()",1);
</script>
</head>
<body>
<form>
<input type="text" id="clock" size="50"? />
</form>
</body>
</html>
為什么這兩句執(zhí)行效果一樣??？
?setInterval("clock()",1000);
?? //setInterval("clock()",1);
2016-12-09
var Inter= setInterval(function(){document.write("2秒:"+new Date().toLocaleTimeString()+"<br/>")},2000);
var Inter= setInterval(function(){document.write("1秒:"+new Date().toLocaleTimeString()+"<br/>")},1000);
var Inter= setInterval(function(){document.write("1豪秒:"+new Date().toLocaleTimeString()+"<br/>")},1);
執(zhí)行這個(gè)之后，看結(jié)果
2016-12-09
實(shí)現(xiàn)定時(shí)調(diào)用的函數(shù)，可按照指定的周期(以毫秒計(jì))來(lái)調(diào)用函數(shù);你獲取的是當(dāng)前時(shí)間，setInterval("clock()",1000);這個(gè)是1000毫秒后執(zhí)行，時(shí)間也是1000毫秒之后的時(shí)間；