const letters = [ { letter: 'a', }, { letter: 'b', }, { letter: 'c', }, ] const index = letters.indexOf({ letter: 'b', }) index will be -1 which means the item was not found. Because objects are compared by reference, not by their values (differently for primitive ...
Introduction to lastIndexOf() Method The lastIndexOf() method in JavaScript is used to search a string or array for a specified value and return the position of the last occurrence of that value. This method is similar to the indexOf() method, but instead of returning the first occurrence...
首先我们需要一个HTML页面,包含一个列表元素,如下所示: <ulid="myList">Item 1Item 2Item 3 1. 2. 3. 4. 5. 接下来,我们将使用JavaScript代码获取这些列表项,并将它们存储在一个数组中: constlist=document.getElementById('myList');constitems=Array.from(list.children).map(item=>item.innerText); ...
j a v a2s. com--> var resultsElement = document.getElementById("results"); document.writeln(resultsElement.nodeType); document.writeln(resultsElement.nodeName); var secondChild = resultsElement.childNodes.item(1); document.writeln(secondChild.nodeName); Click to view the demoThe code ...
DefaultErrorResponseErrorDetailsItem DeletedAppRestoreRequest DeletedSite DeletedWebAppCollection DeletedWebApps DeletedWebAppsGetDeletedWebAppByLocationOptionalParams DeletedWebAppsGetDeletedWebAppByLocationResponse DeletedWebAppsListByLocationNextOptionalParams DeletedWebAppsListByLocationNextResponse DeletedWebAppsLis...
DefaultErrorResponseErrorDetailsItem DeletedAppRestoreRequest DeletedSite DeletedWebAppCollection DeletedWebApps DeletedWebAppsGetDeletedWebAppByLocationOptionalParams DeletedWebAppsGetDeletedWebAppByLocationResponse DeletedWebAppsListByLocationNextOptionalParams DeletedW...
DefaultErrorResponseErrorDetailsItem DeletedAppRestoreRequest DeletedSite DeletedWebAppCollection DeletedWebApps DeletedWebAppsGetDeletedWebAppByLocationOptionalParams DeletedWebAppsGetDeletedWebAppByLocationResponse DeletedWebAppsListByLocationNextOptionalParams DeletedWebAppsListByLocationNextResponse DeletedWebAppsListByLo...
currShape = vwaShapes.getItemAtIndex(i); // Create a new list item element and text for the list item. var newNode = document.createElement("li"); var nodeText; // Determine whether the current shape is selected. if (currShape == vwaPage.getSelectedShape()) { nodeText = document.cre...
In the JavaScript Array.prototype.forEach() method, you can get the index of the current element in the loop by using the (optional) second parameter of the callback function, for example, like so: const
QueueWorkItem method (Windows) MDM_Policy_Config01_TaskScheduler02 class (Windows) MF_CAPTURE_ENGINE_EVENT_STREAM_INDEX attribute (Windows) InterlockedBitTestAndComplement64 function (Windows) InterlockedExchangeAddNoFence64 function (Windows) Creating an Index File (Windows) Working with ALinks (Windows...