如何用js随机产生四个随机字母

JavaScript024

如何用js随机产生四个随机字母,第1张

所有随机的东西都要用到随机数,js中是用到Math.random()这个方法,获取0~1之间的数.

产生随机4个英文字母详情看下面代码!

<!doctype

html>

<html

lang="en">

<head>

<meta

charset="UTF-8">

</head>

<div

id="result"></div><button

onclick="getRanNum()">生成</button>

<body>

<script>

var

result

=

[]

function

getRanNum(){

result

=

[]

for(var

i=0i<4i++){

var

ranNum

=

Math.ceil(Math.random()

*

25)

//生成一个0到25的数字

//大写字母'A'的ASCII是65,A~Z的ASCII码就是65

+

0~25然后调用String.fromCharCode()传入ASCII值返回相应的字符并push进数组里

result.push(String.fromCharCode(65+ranNum))

}

document.getElementById('result').innerText

=

result.toString()

}

</script>

</body>

</html>

<script language="javascript">

function randomString(len) {

len = len || 32

var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678' /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/

var maxPos = $chars.length

var pwd = ''

for (i = 0i <leni++) {

pwd += $chars.charAt(Math.floor(Math.random() * maxPos))

}

return pwd

}

document.write(randomString(32))

</script>

<script type="text/javascript">

get()

function get(){

var n = 'abcdefghijklmnopqrstuvwxyz'

n = n.split('')

ran = parseInt(Math.random()*n.length+1)

n1 = n.splice(ran,1)

ran = parseInt(Math.random()*n.length+1)

n2 = n.splice(ran,1)

document.write(n1 + ' ' + n2)

}

</script>