var arr = [1,3,6,2,7,8,2,5,7,8,0]
var count2 = 0
var count7 = 0
for(var i = 0i<arr.lengthi++){
if(arr[i] === 2){
console.log("2出现在第"+i+"个")
count2++
}
if(arr[i] === 7){
console.log("7出现在第"+i+"个")
count7++
}
}
console.log("2出现了"+count2+"次")
console.log("7出现了"+count7+"次")
</script>
点击按钮出现60秒倒计时的简单js代码(推荐)<!DOCTYPE
html
PUBLIC
"-//W3C//DTD
XHTML
1.0
Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html
xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta
http-equiv="Content-Type"
content="text/html
charset=utf-8"
/>
<title>点击按钮出现60秒倒计时的简单js代码(推荐)</title>
<script
type="text/javascript"
src="js/jquery.js"></script>
</head>
<body>
<input
type="button"
id="btn"
value="免费获取验证码"
onclick="settime(this)"
/>
<script
type="text/javascript">
var
countdown=60
function
settime(val)
{
if
(countdown
==
0)
{
val.removeAttribute("disabled")
val.value="免费获取验证码"
countdown
=
60
}
else
{
val.setAttribute("disabled",
true)
val.value="重新发送("
+
countdown
+
")"
countdown--
}
setTimeout(function()
{
settime(val)
},1000)
}
</script>
</body>
</html>
以上这篇点击按钮出现60秒倒计时的简单js代码(推荐)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
