function getRandStr$length $str = ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890; $randStr = str_shuffle$str; $rands= substr$randStr 0 $length; return $rands;转js代码

function getRandStr(length) { var str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890'; var randStr = str.split('').sort(function() {return 0.5-Math.random()}).join(''); var rands = randStr.substr(0, length); return rands; }