function hasClass(element, className) { return (' ' + element.className + ' ').indexOf(' ' + className+ ' ') > -1; } Otherwise you will also gettrueif the class you are looking for is part of another class name. DEMO jQuery uses a similar (if not the same) method. Applied ...
getElementById("myButton"); myButton.addEventListener("click", onButtonClick, true); let container = document.getElementById("container"); container.addEventListener("click", onContainerClick, true); document.addEventListener("click", onDocumentClick, true); window.addEventListener("click", onWinow...
If a number is supplied, delay is applied to both hide/show Object structure is: delay: { show: 500, hide: 100 } container string | false false Appends the tooltip to a specific element container: 'body' 注意! 可以针对单个工具提示指定单独的data属性。 标记 hover over me 方法 $().tool...
const elementContains = (parent, child) => parent !== child && parent.contains(child); elementContains(document.querySelector('head'), document.querySelector('title')); // true elementContains(document.querySelector('body'), document.querySelector('body')); // false 6.getStyle:返回指定元...
is.url(str, regExp) Check if string str is a valid url (regExp optional).const elm = Rocket.dom.element('.element'); const filename = 'filename.json'; const time = '12:54:07'; Rocket.exists(elm); // true Rocket.has.spaces('This is a test'); // true Rocket.has.class(elm...
The following example demonstrates how you can use the activeElement property to check if the element with class name .name has focus: const elem = document.querySelector('.name'); if (elem === document.activeElement) { console.log('Element has focus!'); } else { console.log(`Element...
container = document.getElementById("observersContainer" ); // 具体的被观察者 //Subject 类扩展controlCheckbox 类 extend(new Subject(), controlCheckbox ); //点击checkbox 将会触发对观察者的通知 controlCheckbox["onclick"] =new Function("controlCheckbox.Notify(controlCheckbox.checked)"); ...
如果作为一个函数(不带有运算符 new)调用时,Boolean() 只将把它的参数转换成一个原始的布尔值,并且返回这个值,如果省略 value 参数,或者设置为0、-0、null、""、false、undefined或NaN,则该对象设置为 false。否则设置为 true(即使 value 参数是字符串false)。
(b.filter.ID=function(e){var t=e.replace(te,ne);return function(e){return e.getAttribute("id")===t}},b.find.ID=function(e,t){if("undefined"!=typeof t.getElementById&&E){var n=t.getElementById(e);return n?[n]:[]}}):(b.filter.ID=function(e){var n=e.replace(te,ne);...
All dropdown events have a relatedTarget property, whose value is the toggling anchor element. Event TypeDescription show.bs.dropdown This event fires immediately when the show instance method is called. shown.bs.dropdown This event is fired when the dropdown has been made visible to the user...