为什么我这段代码报错className未定义

Question

function getEle(selector) {    return document.querySelector(selector);}function getAllEle(selector) {    return document.querySelectorAll(selector);}function getCls(element) {//获取样式class    return element.className;}function setCls(element, cls) {//设置样式    element.className=cls ;}function addCls(element, cls) {//添加样式    var baseCls = getCls(element);    if (baseCls.indexOf(cls) === -1) {        setCls(element, baseCls + ' ' + cls);    }}function delCls(element, cls) {//删除样式    var baseCls = getCls(element);    if (baseCls.indexOf(cls) > -1) {        setCls(element, baseCls.split(cls).join(' ').replace('/\s+/g', ' '));    }}function setEleInit(screen) {    var eleInit = setScreenAnimate[screen];    for (var i = 0; i < eleInit.length; i++) {        var ele = document.querySelector(eleInit[i]);        var baseCls = getCls(ele);        setCls(ele[i], baseCls + ' ' + baseCls + '_init');    }}function setEleDone(screen) {    var eleInit = setScreenAnimate[screen];    for (var i = 0; i < eleInit.length; i++) {        var ele = document.querySelector(eleInit[i]);        var baseCls = getCls(ele);        setCls(ele[i], baseCls.replace('init', 'done'));    }}var setScreenAnimate = {    '.screen-1': ['.screen-1__heading', '.screen-1__subheading'],    '.screen-2': ['.screen-2__heading', '.screen-2__subheading', '.screen-2__tip', '.screen-2__pic-2', '.screen-2__pic-3'],    '.screen-3': ['.screen-3__heading', '.screen-3__subheading', '.screen-3__tip', '.screen-3__pic', '.screen-3__feature'],    '.screen-4': ['.screen-4__heading', '.screen-4__subheading', '.screen-4__tip', '.screen-4__item-1', '.screen-4__item-2', '.screen-4__item-3', '.screen-4__item-4'],    '.screen-5': ['.screen-5__heading', '.screen-5__subheading', '.screen-5__tip', '.screen-5__pic']};var k;for (k in setScreenAnimate) {    setEleInit(k);}

Answer 1

function setEleInit(screen) {
   var eleInit = setScreenAnimate[screen];
   for (var i = 0; i < eleInit.length; i++) {
       var ele = document.querySelector(eleInit[i]);
       var baseCls = getCls(ele);
       setCls(ele[i], baseCls + ' ' + baseCls + '_init');
   }
}

这一段代码中的：setCls(ele[i], baseCls + ' ' + baseCls + '_init'); 改成：setCls(ele, baseCls + ' ' + baseCls + '_init');