element.classList.contains(class); This works on all current browsers and there are polyfills to support older browsers too. Alternatively, if you work with older browsers and don’t want to use polyfills to fix
If activated 'template', 'content' and 'title' options will be sanitized. whiteList object Default value Object which contains allowed attributes and tags sanitizeFn null | function null Here you can supply your own sanitize function. This can be useful if you prefer to use a dedicated library...
In JavaScript, you can use the contains() method provided by the classList object to check if any element contains a specific CSS class. This method returns true if the class exists. Otherwise, false is returned. Let us say we have the following HTML element: Subscribe Now And we ...
functioncheckout(name, movie, filmList, customerList) {if(movieList.contains(movie)) {varc =newCustomer(name, movie); customerList.append(c); filmList.remove(movie) }else{ console.log(movie+ "is not available") } } 下面使用简单的代码测试checkout函数 varmovies =createArr(_movies);varmovi...
If activated 'template', 'content' and 'title' options will be sanitized. whiteList object Default value Object which contains allowed attributes and tags sanitizeFn null | function null Here you can supply your own sanitize function. This can be useful if you prefer to use a dedicated library...
fnGetVersion(),fnSubmitForm(),fnInit();涉及返回逻辑值的函数可以使用is,has,contains等表示逻辑的词语代替动词,例如:fnIsObject(),fnHasClass(),fnContainsElment()。 内部函数:使用_fn+动词+名词形式,内部函数必需在函数最后定义。 例如: 代码语言:javascript ...
function isElementInViewport (el) { //special bonus for those using jQuery if (typeof jQuery === "function" && el instanceof jQuery) { el = el[0]; } var rect = el.getBoundingClientRect(); return ( rect.top >= 0 && rect.left >= 0 && rect.bottom <= (wind...
5.`arrayToHtmlList`:数组转`li`列表 此代码段将数组的元素转换为标签,并将其附加到给定ID的列表中。 代码语言:javascript 复制 constarrayToHtmlList=(arr,listID)=>(el=>((el=document.querySelector('#'+listID)),(el.innerHTML+=arr.map(item=>`${item}`).join('')))();arrayToHtmlList(['...
Like TDD, it uses suite() and test(), but resembling BDD, it also contains before(), after(), beforeEach(), and afterEach(). function ok(expr, msg) { if (!expr) throw new Error(msg); } suite('Array'); test('#length', function() { var arr = [1, 2, 3]; ok(arr.length...
const win= window, doc =document, height, rects;if(!elem || (elem && elem.nodeType !== 1) || !elem.getClientRects || !doc.elementFromPoint || !doc.querySelector || !elem.contains) {returnfalse; }if(elem.offsetWidth === 0 || elem.offsetHeight === 0) {returnfalse; ...