log('loop'); return item.length>4; }) result2; // -1基本方法之 - 操作#对原数组无影响join , 将数组元素用特定的字符( 默认为逗号)拼接成字符串 => Stringvar arr = [1,2,3,4] var str1 = arr.join(); console.log(str1); // '1,2,3,4' var str2 = arr.join('&'); console...
如下：// 第一种写法constarr=newArray(10)// 不缓存for(vari=0;i<arr.length;i++){}Constructr...
let result=[]; loop:for(let i = 0,n = target.length;i < n; i++) {for(let x = i + 1;x < n;x++) {if(target[x] ===target[i]) {continueloop; } } result.push(target[i]); }returnresult; }/** * 去重操作,无序状态,效率最高 * 都会转换为字符串 * @param target * @...
Here, we can see thatlengthproperty returns the number of items in each array. It returns the integer just greater than the highest index in anArray. Example 2: Using Array length in for loop varlanguages = ["JavaScript","Python","C++","Java","Lua"];// languages.length can be used ...
or the classical for loop var items = ['one','two','three'] for(var i=0,l=items.length; i < l ; i++){ console.log(items[i]); } // logs: 'one','two','three' eg8: var myStringArray = ['Hello', 'World']; // array uses [] not {} ...
The example loops over the array of words with the classic for loop. for (let i=0; i<words.length; i++) { The i variable is the auxiliary counter value. We determine the size of the array with the length property. In the first phase, we initiate the counter i to zero. This ...
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JavaScript – Create array JavaScript – Array length JavaScript – Access elements of array using index JavaScript – Loop over an Array JavaScript – Array forEach() JavaScript – Join elements of array to a string JavaScript – Add element to starting of array JavaScript – Add element to end...
eg3: eg3: JavaScript 中循环遍历Array 与Map 的方法 小结_ 这篇文章主要介绍了 JavaScript 中循环遍历 Array 与 Map 的各种方法,利用的都是 js 入门学习中的基础学问, 需要的伴侣可以参考下 js 循环数组各种方法eg1: for (var i = 0; i myStringArray.length; i++) { alert(myStringArray[i]); //Do...
例如,我知道如何使用 JavaScript for 循环在数组中循环,但我仍然不明白 array.length -1 是什么意思,特别是 -1 部分。 当在数组上使用 for 循环时,我们有这样的事情: for (i = 0; i < array.length; i++) {...} 但我有时也看到过这样的事情: for (i = 0; i < array.length - 1; i++)...