<script>// JavaScript code for every() functionfunctionispositive(element, index, array){returnelement >0; }functionfunc(){vararr = [11,89,23,7,98];// Check for positive numbervarvalue = arr.every(ispositive);document.wri...
function isGreaterThan5(element, index, array) { return element > 5; } function func() { // Original array var array = [2, 5, 8, 1, 4]; // Checking for condition in array var value = array.some(isGreaterThan5); document.write(value); } func(); </script> 1. 2. 3. 4. ...
那现在怎么办？？当然是使用 console.log const var1 = db.column1console.log（var1）//->stringconst var2 = db.column2console.log（var2）//->boolean（true / false）const var3 = db.column3console.log（var3）//- > numberconst var4 = db.column4console.log（var4）//->array 这只会浪费...
程序1: <script>// JavaScript code forevery() functionfunctionispositive(element, index, array){returnelement >0; }functionfunc(){vararr = [11,89,23,7,98];// check for positive// numbervarvalue = arr.every(ispositive);document.write(value); } func();</script> 输出: true 程序2: <...
length>4});//truecars.filter(function(item, index, arr){returnitem.length>4});//["Mercedes-benz", "Tesla"]cars.map(function(item, index, arr){return'New-' + item});//["New-Mercedes-benz", "New-BMW", "New-Audi", "New-Tesla"]cars.forEach(function(item, index, arr){//code...
= 3) { err = 1; return false; } else { strYear = strDateArray[0]; strMonth = strDateArray[1]; strDay = strDateArray[2]; } intday = parseInt(strDay, 10); if (isNaN(intday)) { err = 2; return false; } intMonth = parseInt(strMonth, 10); if (isNaN(intMonth)) { ...
JavaScript Array 参考链接:The complete guide to JavaScript arrays – Code The Web What is an array? How to reference a value in an array Array functions string.split() array.join() array.reverse() array.indexOf() array.lastIndexOf()...
functioninitializeScript(){/// Define a visualizer class for the object.//classmyVisualizer{/// Create an ES6 generator function which yields back all the values in the array.//*[Symbol.iterator]() {varsize =this.m_size;varptr =this.m_pValues;for(vari =0; i < size; ++i) {yield...
View Code 四、Array.reduce/Array.reduceRight(数组迭代) 先不看标题,来个题目:如何求数组[1,2,3,4,5]的各项累加的和? 大多数人恐怕会立即说出for循环、while循环,的确,for循环和while循环是可以解决上述问题,但是,这个答案显然脱离了此篇博客的主题:逼格!!!
JavaScript中循环语句不少,for、for in、for of和forEach循环,今天对比Array、Object、Set(ES6)、Map(ES6)四种数据结构循环语句支持的情况及区别。 新建四种数据类型的测试数据 代码语言:javascript 复制 letarr=[1,2,3,4,5,6];letobj={a:1,b:2,c:3};letmap=newMap([['a','a1'],['b','b2'],[...