(function(window, document, undefined) {    var interval = 800;    var closeDelay = 200;    var index = 0;    var couponLinks;    var getCoupon = function() {        if (index >= couponLinks.length) {            console.log("领取完毕");            return;        }        var coponLink = couponLinks[index];        coponLink.click(); index++;        console.log("领取 第" + index + " 张");        setTimeout(getCoupon, interval);        setTimeout(function() {            var close = document.querySelector(‘.mui-dialog-close‘);            if (close != null) close.click();        }, closeDelay);    };    var _scrollTop = 0;    var _scrollStep = document.documentElement.clientHeight;    var _maxScrollTop = document.body.clientHeight - document.documentElement.clientHeight;    var autoScrollDown = setInterval(function() {        _scrollTop += _scrollStep;        if (_scrollTop > _maxScrollTop) {            clearInterval(autoScrollDown);            couponLinks = document.querySelectorAll(‘.mui-act-item-yhqbtn‘);            console.log("总共：" + couponLinks.length + "条张优惠券待领取...");            getCoupon();        } else {            document.body.scrollTop = _scrollTop;        }    }, 500);}) (window, document);