JavaScript生成随机数及随机字母



JavaScript生成随机数及随机字母

1. Math.random()生成一个0~1的随机数 0<=Math.random()<1

2. Math.random()*100 则生成一个0~100之间的随机数

3. Math.random()*100 + 100 则生成一个100~200之间的随机数

4. 所以Math.random()*m 则生成一个0~m的随机数

下面是一个生成随机字母(随机密码的JavaScript)

<script type="text/javascript" language="javascript">

function randomPassword()

{

var seed = new Array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z',

'a','b','c','d','e','f','g','h','i','j','k','m','n','p','Q','r','s','t','u','v','w','x','y','z',

'2','3','4','5','6','7','8','9'

);//数组

seedlength = seed.length;//数组长度

var createPassword = '';

for (i=0;i<10;i++) {

j = Math.floor(Math.random()*seedlength);

createPassword += seed[j];

}

return createPassword;

}

alert(randomPassword());

</script>