html:
<div><span>单号:</span><span id="oddnum" style="color:#8700FF;font-weight: bold "></span></div>
jq:
$(function () { open() }) function getCode(n) { var all = "azxcvbnmsdfghjklqwertyuiopZXCVBNMASDFGHJKLQWERTYUIOP0123456789"; var b = ""; for (var i = 0; i < n; i++) { var index = Math.floor(Math.random() * 62); b += all.charAt(index); } return b; }; function open() { $("#oddnum").html(getCode(20)); }