11)for in Array 例3.11.1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> var a=['hello','teacher','马克-to-win']; for(var iii in a){ this.document.write('inidex'+iii+'的值是'+a[iii]+""); } ...
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参数 callbackFn 为数组中每个元素执行的函数。并会丢弃它的返回值。该函数被调用时将传入以下参数: element 数组中正在处理的当前元素。 index 数组中正在处理的当前元素的索引。 array 调用了 forEach() 的数组本身。 thisArg 可选 执行callbackFn 时用作 this 的值。参见迭代方法。返回...
javascript 原文地址:http://colintoh.com/blog/5-array-methods-that-you-should-use-today?utm_source=javascriptweekly& 寒月十八 2018/01/30 1.1K0 forin forof forEach myForEach foreach <!DOCTYPE html> Document let arr=[1,3,5,7,9]; for(let i=0;i<arr.leng 贵哥的编程之路 202...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 <!DOCTYPEhtml><!--设置 meta 视口标签-->JavaScript// 数组索引letarr=['apple','banana','cherry'];console.log(arr[0]);// 输出 : appleconsole.log(arr[1]);// 输出 : bananaconsole.log(arr[2]);// 输出 : cherryconsole.log(arr[3]);...
js constobj={a:1,b:2,c:3};for(constpropinobj){console.log(`obj.${prop}=${obj[prop]}`);Object.defineProperty(obj,"c",{enumerable:false});} Specification ECMAScript® 2026 Language Specification #sec-for-in-and-for-of-statements...
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach question Array.prototype.myForEach Array.prototype.myForEach=function(visitors, context) {// 实现}// 测试用例constnums = [1,2,3]; nums.myForEach(function(a, b, c, thisObj) {console.log(`a,...
Array.prototype.filter() Array.prototype.find() Array.prototype.findIndex() Array.prototype.findLast() Array.prototype.findLastIndex() Array.prototype.flat() Array.prototype.flatMap() Array.prototype.forEach() Array.from() 实验性 Array.prototype.group() (en-US) 实验性 Array.prototype.groupToMa...
TheforEach()method executes a provided function once per array element. Syntax arr.forEach(callback[,thisArg]) Parameters callback Function to execute for each element, taking three arguments: currentValue The current element being processed in the array. ...
For example "EN-US", for United States English. <String> directionsLengthUnits Optional Length units. Supported units are miles and kilometers. Use the constant units or their string equivalents ("esriKilometers" | "esriMiles"). Known values: esriUnits.KILOMETERS | esriUnits.MILES <Boolean>...