JavaScript Array filter() 方法JavaScript Array 对象实例返回数组 ages 中所有元素都大于 18 的元素:var ages = [32, 33, 16, 40];function checkAdult(age) { return age >= 18;}function myFunction() { document.getElementById("demo").innerHTML = ages.filter(checkAdult);...
JS array filter contextIn the next example, we use a context object in the filtering. filter_range.js function isInRange(val) { return val >= this.lower && val <= this.upper; } let range = { lower: 1, upper: 10 }; let data = [-2, -1, 0, 1, 2, 3, 4, 5, 6, 7, ...
利用filter ,可以巧妙地去除Array的重复元素: var r, arr = ['apple', 'strawberry', 'banana', 'pear', 'apple', 'orange', 'orange', 'strawberry']; r = arr.filter(function (element, index, self) { return self.indexOf(element) === index; }); console.log(r.toString()); 1. 2. 3...
functionisInRange(value){if(typeofvalue !=='number') {returnfalse;}returnvalue >=this.lower && value <=this.upper;} letdata = [10,20,"30",1,5,'JavaScript filter',undefined,'example']; letrange = {lower:1,upp...
array.filter(function(currentValue,index,arr),thisValue); function(currentValue,index,arr); //必须,函数,数组中的每个元素都会执行这个函数 currentValue //必须,当前元素的值 index //可选,当前元素的索引值 arr //可选,当前元素属于的数组对象
doneTodos: state=>{returnstate.todos.filter(function(todo){returntodo=todo.done}) }, doneTodosCount: (state, getters)=>{//state :可以访问数据//getters:访问其他函数,等同于 store.gettersreturngetters.doneTodos.length }, getTodoById: (state)=> (id) =>{returnstate.todos.find(todo => todo...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 // 参数是函数名functioncheck(arg){returnarg>10;}varbool=ages.some(check)// 参数是闭包函数// index、arr 分别为数组索引、数组数据varbool=ages.some(function(item,index,arr){returnitem>10;})console.log(bool) ...
JavaScript中通过array.map()实现数据转换、创建派生数组、异步数据流处理、复杂API请求、DOM操作、搜索和过滤等,array.map()的使用详解(附实际应用代码) array.map()可以用来数据转换、创建派生数组、应用函数、链式调用、异步数据流处理、复杂API请求梳理、提供DOM操作、用来搜索和过滤等,比for好用太多了,主要是写法...
Example 2: Searching in Array constlanguages = ["JavaScript","Python","Ruby","C","C++","Swift","PHP","Java"];functionsearchFor(arr, query){functioncondition(element){returnelement.toLowerCase().indexOf(query.toLowerCase()) !==-1; ...
var reformattedArray = kvArray.map(function(obj) { var rObj = {}; rObj[obj.key] = obj.value; return rObj; }); // reformattedArray 数组为: [{1: 10}, {2: 20}, {3: 30}], // kvArray 数组未被修改: // [{key: 1, value: 10}, ...