function clearArray(arr) { arr.length = 0; } 清除对象 你可以遍历对象的键并使用delete操作符来删除每个键: javascript function clearObject(obj) { Object.keys(obj).forEach(key => delete obj[key]); } 综合示例:clearAll函数 以下是一个综合示例,展示了如何定义一个clearAll函数来清除文本框、...
== null) { for (let prop in collection) { if (collection.hasOwnProperty(prop)) { delete collection[prop]; } } } } // 使用示例 let myArray = [1, 2, 3]; let myObject = { a: 1, b: 2, c: 3 }; clearAll(myArray); // myArray 现在为空数组 clearAll(myObject); // my...
// querySelectorAll返回NodeList 对象,NodeList 不是一个数组,是一个类似数组的对象(Like Array Object)。// 虽然 NodeList 不是一个数组,但是可以使用 forEach() 来迭代。你还可以使用 Array.from() 将其转换为数组。returnArray.from(this.items).indexOf(this.getSelectedItem());}// 跳转到指定索引的图...
const{Heap}=require('heap-js');// Get all tasks from the databaseconsttasks=db.collection.find().toArray();// The most important task has the lowest priority valueconstcustomPriorityComparator=(a,b)=>a.priority-b.priority;// Create the priority queueconstpriorityQueue=newHeap(customPriorityC...
Array.prototype.push2 =function(...arrs) { let len=this.lengthfor(vari = 0; i < arrs.length; i++) {this[this.length] =arrs[i] }returnthis.length } 13、实现数组map Array.prototype.map2 =function(callback) { let newArr=[]for(vari = 0; i <this.length; i++) { ...
clear Clear all key/data.store.clear() ⚠️Deprecatestore(false)because it is easy to empty the library because of passing in a null value or reporting an error store.clear() keys Return an array of allkeys.store.keys(). store.keys()//⇒ ["w1", "w2", "w3"] ...
formats: an array of objects representing types of files, with the following properties: formatID: a string that uniquely identifies the format (may be the same as mimeType) mimeType (optional): the file format's designated media type, e.g. "image/png" (palette formats do not have ...
To clear all intervals, you'll need to store all of them:var arr = []; arr.push(setInterval(function () { console.log(1); }, 1000)); arr.push(setInterval(function () { console.log(2); }, 1000)); arr.push(setInterval(function () { console.log(3); }, 1000)); Following...
回答问题1 // contentType:"application/pdf;charset=utf-8", // url:"{% url netPan.File.views.browserFuf%}", // data:{ // id: preFileId // }, // success:function(data){ // var pdfAsDataUri = data; // //如果引入了viewer.js , 处理方法 // var pdfAsArray = convertDataURI...
clear() 清空标注层上的标注 show() 显示标注层 hide() 隐藏标注层 getAllOverlays() 获取标注层内的所有标注对象 返回值: Array<any>: AMap.CustomLayer 自定义图层是一种完全由开发者来指定绘制方法的图层 相关示例 new AMap.CustomLayer(canvas: HTMLCanvasElement, opts: CustomLayerOption) 参数说...