let elements = document.getElementsByClassName('myClass'); let elementsWithMultipleClasses = document.getElementsByClassName('class1 class2'); 工作原理 getElementsByClassName遍历整个 DOM 树来查找所有class属性值匹配的元素。 返回的结果是一个动态的 HTMLCollection 对象。 性能 性能较好,但不如getElementById。
Handles multiple classes: Correctly identifies elements even if they have multiple class names. Uses classList for modern browsers: Utilizes the more efficient classList.contains method where available. Node type check: Ensures only element nodes are checked, avoiding potential errors. Clearer variable ...
Traversing the DOM tree up to the root. Considering all possible CSS selectors (tags, classes, IDs, attributes, combinations, pseudo-selectors, etc.). Potentially generating multiple valid selectors for the same element. Dealing with dynamic content and changes in the DOM. While libraries exist to...
Multiple Classes to array Advanced querySelectorAll() vs querySelector() Performance TroubleshootingQuestions What is querySelectorAll() in JavaScript? How does querySelectorAll() differ from getElementsByClassName() and getElementsByTagName()? Why does querySelectorAll() return a NodeList instead ...
CSS selectorsStringRequired. Specifies one or more CSS selectors to match the element. These are used to select HTML elements based on their id, classes, types, attributes, values of attributes, etc. For multiple selectors, separate each selector with a comma. ...
Other need says if it is a need to find multiple elements or say all elements in document to match with the CSS selectors or query selectors then it will involve and make use of querySelectorAll() method for performing all the operations to find all elements in one go. ...
Also, in the case ofclass, we need to use.before adding theclassname as the selector. You can also use otherids,classes, orelementsto define features explicitly in the care of other selectors. Let’s see a demonstration. <!DOCTYPE html><html><head><metacharset="utf-8"><metaname="view...
If multiple relationships are specified, the SOQLQueryBuilder class will throw an exception and have to be specified the child relationship name with the setChildRelationshipName method. If only one relationship is specified, the SOQLQueryBuilder class will use it automatically. SOQLQueryBuilder soqlQu...
noMultipleSpacesInRegularExpressionLiterals a11y/useValidLang complexity/noUselessEmptyExport nursery/noUndeclaredDependencies nursery/noConsole a11y/useValidAriaRole correctness/noConstantCondition a11y/useAriaActivedescendantWithTabindex nursery/noYodaExpression style/useDefaultParameterLast complexity/noEmptyType...
It can be Id, classes, type of elements(such as <div>, or <p>), or even specific attributes and their values. To define multiple selectors, separate them with commas(,). Return ValueThis method returns a NodeList object that holds a collection of elements that matches the given CSS ...